Berberine Complex [Discontinued] by Swanson Premium Brand

POSSIBLY EFFECTIVE

• Canker sores. Some evidence shows that berberine gel applied to canker sores may reduce pain and the size of the sores, but it has not been compared to conventional treatments. Details: Some clinical research shows that applying a gel containing berberine 5 mg/gram four times daily for 5 days can reduce pain by 26% and ulcer size by 30% when compared with placebo in patients with minor recurrent canker sores. Erythema and exudation also appear to be improved (91955).
• Diabetes. Berberine seems to moderately reduce blood glucose in people with type 2 diabetes; it may provide additional benefit when given with conventional medications. Details: Some clinical research shows that taking berberine 500 mg 2-3 times daily for 2-4 months can reduce glycated hemoglobin (HbA1c), fasting plasma glucose (FPG), and postprandial glucose (PPG) in subjects with type 2 diabetes when compared with placebo, and may be similarly effective to metformin 500 mg 2-3 times daily or rosiglitazone 4 mg daily (20579,34247,34265,110099). Large meta-analyses show that taking berberine, 0.9-3 grams in 2-3 divided doses daily for 1-11 months, in combination with lifestyle interventions, can reduce FPG by 10-16 mg/dL, PPG by 27-34 mg/dL, and HbA1c by 0.4% to 0.7% when compared with lifestyle interventions alone. Also, taking berberine in combination with oral hypoglycemic drugs appears to lower FPG by 12-19 mg/dL, PPG by 18-24 mg/dL, and HbA1c by 0.6% to 0.9% when compared with hypoglycemic drugs alone (91956,110097). Berberine has also been evaluated in combination with other ingredients. A small clinical study in patients with type 2 diabetes shows that taking berberine 500 mg with Bifidobacterium adolescentis 100 million colony-forming units (CFU) twice daily for 16 weeks reduces FPG by 10 mg/dL, PPG by 28 mg/dL, and HbA1c by 0.22% when compared with placebo (110099). Another clinical study in patients with type 2 diabetes shows that taking berberine 600 mg twice daily with a multi-strain probiotic supplement, containing more than 50 billion CFU, once daily for 12 weeks reduces postprandial cholesterol by 15 mg/dL and postprandial low-density lipoprotein (LDL) cholesterol by 9 mg/dL when compared with placebo. Postprandial triglyceride levels were also improved, while postprandial levels of high-density lipoprotein (HDL) cholesterol were not affected (110100).
• Helicobacter pylori. Oral berberine, when taken with amoxicillin and a proton pump inhibitor (PPI) with or without clarithromycin, might be as effective as bismuth-containing quadruple therapy (BQT), vonoprazan quadruple therapy, and PPI-based triple therapy for eradication of Helicobacter pylori. Details: Most studies evaluate berberine in combination with an antibiotic and acid blocker for the treatment of H. pylori infection. Open-label clinical studies in patients with treatment-naïve H. pylori infection shows that taking berberine 300-500 mg with amoxicillin 1 gram and an acid reducer such as esomeprazole 20 mg, rabeprazole 10 mg, or vonoprazan 20 mg, with or without clarithromycin 500 mg, 2-3 times daily for 14 days is non-inferior to BQT, vonoprazan quadruple therapy (vonoprazan, amoxicillin, clarithromycin, bismuth), and rabeprazole quadruple therapy (rabeprazole, amoxicillin, clarithromycin, bismuth) for H. pylori eradication and clinical symptom improvement. Eradication rates were around 70% to 91% and 69% to 90% in the berberine- and bismuth-containing groups, respectively. BQT is a guideline-recommended treatment regimen for H. pylori eradication (97234,111697). Also, berberine triple therapy appears to be better tolerated when compared with BQT. Quadruple therapy consisted of amoxicillin, rabeprazole, clarithromycin, and bismuth tartrate (110107). A smaller clinical study in patients with H. pylori-associated duodenal ulcers shows that taking berberine 300 mg three times daily for 6 weeks is more effective for eradicating H. pylori than taking ranitidine 150 mg twice daily, but is less effective for promoting ulcer healing (34319).
• Hyperlipidemia. Clinical research shows that taking berberine orally, alone or in combination with other ingredients, reduces total cholesterol, low-density lipoprotein (LDL) cholesterol, and triglycerides in people with hyperlipidemia. Details: Meta-analyses of clinical research in people with hyperlipidemia or nonalcoholic fatty liver disease (NAFLD) show that berberine reduces total cholesterol by 13-32 mg/dL, triglycerides by up to 34 mg/dL, LDL cholesterol by 10-26 mg/dL, and apolipoprotein B by 0.25 g/L when compared with control or lifestyle interventions. However, the meta-analyses conflict on the effect of berberine on HDL cholesterol, with the studies in patients with hyperlipidemia showing that it reduces HDL cholesterol by 2-3 mg/dL while the analysis in patients with NAFLD shows that berberine has no effect on HDL cholesterol when compared with control or lifestyle interventions. (20579,34228,111363,111700,113462). Meta-analyses also show that berberine alone is similarly effective to statins at lowering lipid levels (100983,111362). Administration of berberine in combination with lipid-lowering drugs such as statins lowers total cholesterol by 10-15 mg/dL, LDL cholesterol by up to 9 mg/dL, and triglycerides by up to 30 mg/dL when compared with lipid-lowering drugs alone (91953,91956,99921,100983,111362). The dosage of berberine used most often in these studies was 500 mg twice daily, or 200-500 mg three times daily for 3-24 months. However, one meta-analysis suggests that berberine's effects on lipid levels may be transient, with significant improvements in total cholesterol, LDL cholesterol, and HDL cholesterol lacking in studies lasting 3 or more months (111362). Berberine has also been studied in combination with other supplements. Taking a combination product containing berberine 500 mg, policosanol 10 mg, and red yeast rice 200 mg daily for up to 12 months reduces total and LDL cholesterol levels when compared with placebo or ezetimibe 10 mg (34262,34283,34301). Taking another combination product (Armolipid Plus, Rottapharm S.p.A.) containing berberine, red yeast rice, policosanol, folic acid, coenzyme Q10, and astaxanthin daily for up to 12 months reduces total cholesterol by 10% to 13% and LDL cholesterol by 14% to 21%, and increases HDL cholesterol by 4% to 5% when compared with baseline or placebo. These effects are comparable to those seen with pravastatin 10 mg daily (89438,92142). It is unclear if the benefits of this combination product are due to berberine, other ingredients, or the combination. It is possible that the majority of the therapeutic effect is due to an ingredient in red yeast rice (monacolin K) that is identical to lovastatin.
• Hypertension. Berberine may have added benefits for reducing blood pressure when used in combination with amlodipine. Details: A meta-analysis shows that taking berberine 0.9 grams daily in combination with amlodipine for 2 months reduces systolic blood pressure by 5 mmHg and diastolic blood pressure by 2 mmHg when compared with amlodipine alone (91956).
• Polycystic ovary syndrome (PCOS). Berberine may improve some metabolic characteristics in women with PCOS and insulin resistance. It may also increase live births, although the data are conflicting. Details: Clinical research in patients with PCOS and insulin resistance shows that taking berberine 500-550 mg 2-3 times daily for 3 to 6 months reduces fasting plasma glucose, markers of insulin resistance, total cholesterol, low-density lipoprotein (LDL) cholesterol, triglycerides, testosterone levels, body mass index, waist-to-hip ratio, acne severity, and markers of inflammation when compared with placebo or baseline. Berberine also seems to increase high-density lipoprotein (HDL) cholesterol and sex hormone binding globulin (SHBG) levels (34282,91952,111364). Lipid parameters also improved when compared with metformin, as did waist-to-hip ratio, body mass index, and SHBG levels in some, but not all, studies (34282,91952). The effect of berberine on ovulation, pregnancy, and birth rates in women with PCOS is unclear. A meta-analysis of several small, lower quality clinical studies conducted in China in patients with PCOS shows that taking berberine 900 mg daily in combination with other treatments, such as clomiphene or letrozole, for 3 to 6 months improves ovulation and clinical pregnancy rates when compared to medication therapy alone (115725). The validity of these findings is limited by heterogenous methods between clinical trials, including treatment combinations and duration. Additionally, the effect on birth rates was not evaluated. A clinical study, not included in the analysis above, shows that taking berberine 500 mg three times daily for three months prior to controlled ovarian stimulation increases the number of clinical pregnancies and live births by almost two-fold when compared with placebo. These effects are comparable to taking metformin 500 mg three times daily for 3 months (91952). However, other clinical research shows that taking a combination of berberine 1.5 grams daily and letrozole for ovarian stimulation does not increase live birth rates when compared with letrozole alone (97235).

INSUFFICIENT RELIABLE EVIDENCE to RATE

• Antipsychotic-induced metabolic side effects. It is unclear if oral berberine is beneficial in patients with antipsychotic-induced metabolic side effects. Details: A small clinical study in patients with schizophrenia who developed metabolic syndrome associated with antipsychotic therapy shows that taking berberine 300 mg twice daily for 12 weeks reduces body weight by 1.1 kg, body mass index (BMI) by 0.4 kg/m2, total cholesterol by 22 mg/dL, low-density lipoprotein (LDL) cholesterol by 20 mg/dL, and glycated hemoglobin (HbA1c) by 0.09% when compared with placebo (110103).
• Atrial fibrillation. Limited research suggests that oral berberine might prevent atrial fibrillation shortly after coronary artery bypass graft (CABG) surgery. Details: A small clinical study in Chinese patients who underwent CABG surgery shows that taking berberine 400 mg three times daily for 7 days reduces the risk of postoperative atrial fibrillation by 50% when compared with placebo (110106).
• Biliary disorders. It is unclear if oral berberine is beneficial in patients with biliary disorders. Details: A small clinical study in patients with primary sclerosing cholangitis shows that taking berberine ursodeoxycholate, an ionic salt formulation of berberine and ursodeoxycholic acid, 500-1000 mg twice daily for 6 weeks reduces levels of alkaline phosphatase (ALP), a marker of cholestasis and bile duct injury, when compared with placebo. ALP levels decreased by at least 50% in 7% and 17% of patients taking 500 mg and 1000 mg, respectively, compared with 0% of patients taking placebo (110105).
• Burns. Topical berberine has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: Preliminary clinical research shows that topical treatment of second degree burns with an ointment containing berberine, beta-sitosterol, sesame oil, and other ingredients, applied every 4 hours for 20 days, is similar to conventional treatment with silver sulfadiazine cream (13526). It is unclear if this benefit is due to berberine, other ingredients, or the combination.
• Cardiovascular disease (CVD). It is unclear if berberine is beneficial in patients with CVD. Details: A meta-analysis of several small clinical studies in patients with atherosclerosis, ischemic stroke, or coronary heart disease shows that taking berberine alone does not improve lipid levels or markers of atherosclerosis but does reduce markers of inflammation when compared with routine therapy or statins. Additionally, the pooled analysis suggests that berberine reduces stroke severity, as measured by the NIH Stroke Scale, in patients with ischemic stroke (111362). This meta-analysis also shows that, when taken with a statin, berberine improves lipid levels, stroke severity, markers of atherosclerosis, and inflammatory markers when compared with statin therapy alone or routine treatment (111362). The validity of these findings is limited by the overall low-quality of the included studies, with unclear blinding and randomization; significant heterogeneity and differences in patient populations, berberine doses, and treatment durations studied; and concerns related to publication bias.
• Cholera. Although taking a single dose of berberine may be modestly beneficial for reducing stool volume, using berberine daily with tetracycline does not seem to provide added benefit. Details: Some preliminary clinical research shows that a single dose of berberine sulfate 400 mg decreases 24-hour stool volume by a small amount in subjects with cholera when compared with placebo (262). However, taking berberine 200-400 mg daily along with tetracycline 500 mg four times daily does not seem to further enhance the effects of tetracycline in treating cholera-induced diarrhea (34305,34306).
• Colorectal adenoma. Berberine may help prevent adenoma recurrence after polypectomy. Details: Preliminary clinical research in Chinese patients with colorectal adenomas who had undergone complete polypectomy shows that taking berberine 0.3 grams twice daily for 2 years reduces the risk of adenoma recurrence by 22% when compared with placebo (103197). A meta-analysis of this trial and two other small clinical studies in Chinese patients with a history of colorectal adenomas shows that taking berberine 0.1 grams three times daily for 18 months or 0.3 grams twice daily for 2 years reduces the risk of adenoma recurrence by 31% and 25% at years 1 and 2, respectively, when compared with placebo (110101). All available research has been conducted in China; it is unclear whether these results can be applied to other geographic locations.
• Congestive heart failure (CHF). Berberine may provide additional benefit to patients with CHF who are taking conventional medications. Details: Preliminary clinical research in patients with CHF secondary to ischemic or idiopathic dilated cardiomyopathy shows that adding berberine 1.2-2 grams daily for 8 weeks to conventional medications can reduce the frequency and complexity of premature ventricular contractions (PVCs) and reduce mortality when compared with placebo (13520).
• Coronary heart disease (CHD). Oral berberine has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: Clinical research in statin-intolerant patients with coronary heart disease treated with a percutaneous intervention (PCI) shows that taking a specific combination product (Armolipid Plus, Rottapharm S.p.A.) containing berberine 500 mg, red yeast rice 200 mg, policosanol 10 mg, folic acid 0.2 mg, coenzyme Q10 2 mg, and astaxanthin 0.5 mg daily for 3 months reduces total cholesterol, low-density lipoprotein (LDL) cholesterol, and triglycerides, and increases high-density lipoprotein (HDL) cholesterol to a greater extent than ezetimibe 10 mg daily. Combining this specific product with either ezetimibe or a low-dose statin produces additional improvements in all lipid parameters after 3-12 months of treatment when compared with any of the agents alone (97232,97233). It is unclear if the benefits of this combination product are due to berberine, other ingredients, or the combination. Because red yeast rice contains a compound identical to lovastatin (monacolin K), it is likely that the cholesterol-lowering potential of this combination is mainly attributable to the red yeast rice constituent.
• Diarrhea. Limited data suggest that berberine may be helpful for diarrhea caused by bacteria. Details: Some preliminary clinical research shows that a single dose of berberine sulfate 400 mg decreases 24-hour stool volume in subjects with Escherichia coli-induced diarrhea when compared with placebo (262).
• Glaucoma. It is unclear if berberine is beneficial for glaucoma when used as an eye drop. Details: Preliminary clinical research shows that using eye drops containing berberine 2.5 mg and tetrahydrozoline 2.5 mg for 3 days does not reduce intraocular pressure in patients with open angle glaucoma when compared with eye drops containing tetrahydrozoline alone (34304).
• Hepatitis B. It is unclear if berberine is beneficial for improving liver function in people with hepatitis B. Details: Preliminary clinical research shows that taking berberine 1 gram daily for 2 months decreases blood glucose, triglycerides, and markers of liver damage, including aspartate aminotransferase (AST) and alanine aminotransferase (ALT), in subjects with type 2 diabetes and hepatitis B when compared with control (34265).
• Hepatitis C. It is unclear if berberine is beneficial for improving liver function in people with this form of hepatitis. Details: Preliminary clinical research shows that taking berberine 1 gram daily for 2 months decreases blood glucose, triglycerides, and markers of liver damage, including aspartate aminotransferase (AST) and alanine aminotransferase (ALT), in subjects with type 2 diabetes and hepatitis C when compared with control (34265).
• Impaired glucose tolerance (prediabetes). Small studies suggest that oral berberine may be beneficial in adults with prediabetes. Details: A very small clinical study in adults with overweight and prediabetes shows that taking berberine aqueous root extract (HIMABERB, Pharma Base S.A.) 500 mg 3 times daily for 12 weeks reduces fasting blood glucose by 15 mg/dL, glycated hemoglobin (HbA1c) by 0.7%, and 2-hour oral glucose tolerance test by 28 mg/dL and improves fasting insulin levels and measures of insulin resistance when compared with placebo (111699). The validity of these effects is limited by a very small sample size. Another small clinical study in adults with prediabetes shows that taking berberine phospholipids (Berbevis, Indena, SpA, Italy) 550 mg twice daily for 8 weeks reduces fasting blood glucose by 4 mg/dL and improves insulin levels when compared with placebo (111700).
• Irritable bowel syndrome (IBS). One small clinical study suggests that oral berberine may be beneficial in people with diarrhea-predominant IBS. Details: Preliminary clinical research shows that taking berberine 400 mg twice daily for 8 weeks in patients with diarrhea-predominant IBS reduces the frequency of diarrhea, abdominal pain, and defecation urgency when compared with placebo. Berberine may also improve overall symptom scores and IBS quality of life (97236). Observational research suggests that adding a supplement (Enterofytol PLUS, Tilman SA) providing berberine 200 mg and curcumin 42 mg orally twice daily for 2 months to conventional IBS treatment is associated with improvements in symptoms, such as abdominal discomfort, distension, and stool status, by up to 48% when compared with conventional treatment alone. Use of the supplement was also associated with a 64% reduced need for conventional treatments (113354). It is unclear if this effect is due to berberine, curcumin, or the combination.
• Menopausal symptoms. Oral berberine has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: Preliminary clinical research shows that taking a combination of berberine plus soy isoflavones can reduce vasomotor symptoms in menopausal women when compared with taking calcium plus vitamin D (34287). It is not clear if this effect is due to berberine, soy isoflavones, or the combination.
• Metabolic dysfunction-associated steatotic liver disease (MASLD). It is unclear if oral berberine is beneficial in patients with MASLD. Details: A moderate-sized clinical study in adults with MASLD shows that taking berberine extract 500 mg orally three times daily for 12 weeks does not improve markers of liver damage or insulin resistance, fatty liver indices, or most lipid levels when compared with placebo (114769). Also review effectiveness in nonalcoholic fatty liver disease (NAFLD), a similar condition.
• Metabolic syndrome. Berberine may reduce some of the signs and symptoms of metabolic syndrome, but the evidence is weak. Details: Preliminary clinical research in adults with metabolic syndrome shows that taking berberine hydrochloride 500 mg three times daily before meals for 3 months reduces body mass index (BMI) by 0.6 kg/m2, systolic blood pressure (SBP) by 8 mmHg, triglycerides by 18 mg/dL, and serum glucose levels by 2 mg/dL, and can also improve insulin sensitivity, when compared with baseline (91957). The validity of these findings is limited by the lack of a control group. Other preliminary clinical research shows that taking a combination product (Armolipid Plus, Rottapharm S.p.A.) containing berberine 500 mg, red yeast rice 200 mg, policosanol 10 mg, folic acid 0.2 mg, coenzyme Q10 2 mg, and astaxanthin 0.5 mg daily for 18 weeks improves SBP, left ventricular mass, and flow-mediated dilation in patients with metabolic syndrome when compared with control (34289). It is not clear if this effect is due to berberine, the other ingredients, or the combination.
• Nonalcoholic fatty liver disease (NAFLD). Oral berberine may improve some measures of liver function and blood lipids in people with NAFLD. Details: A meta-analysis of clinical studies and preliminary clinical research in patients with NAFLD, some with comorbid type 2 diabetes, show that taking berberine 600 mg to 6.35 grams daily, alone or in combination with metformin or lifestyle interventions, for 7 to 22 weeks reduces markers of liver damage, including aspartate aminotransferase (AST), alanine aminotransferase (ALT), and glutamyl transpeptidase (GGT) and improves body mass index (BMI), measures of insulin resistance, and most lipid parameters when compared with control and baseline (34286,113462). Other preliminary clinical research shows that taking berberine 500 mg three times daily for 16 weeks reduces hepatic fat content by 21% when compared with lifestyle modification. Berberine also seems to reduce hepatic fat content, AST, and ALT similarly to pioglitazone 15 mg daily, while reducing body weight, body mass index, and total cholesterol more than pioglitazone (97237). Also review effectiveness in metabolic dysfunction-associated steatotic liver disease (MASLD), a similar condition.
• Obesity. It is unclear if oral berberine is beneficial in patients with obesity. Details: A meta-analysis of 12 small clinical studies, most in patients with various metabolic conditions, shows that taking berberine 300-1500 mg daily for up to 24 months reduces body weight by around 2 kg, body mass index (BMI) by 0.5 kg/m2, and waist circumference by about 1 cm when compared with a control group (104508). However, most of the studies are small, of varying quality, with significant heterogeneity, and likely inadequately powered to detect significant changes. Additionally, none of the studies required patients to have overweight or obesity for inclusion.
• Radiation-induced diarrhea. One small study suggests that oral berberine may reduce diarrhea associated with radiation-induced intestinal damage. Details: Preliminary clinical research shows that taking berberine 300 mg three times daily for 2 weeks can reduce the frequency and severity of radiation-induced intestinal damage and diarrhea in patients receiving abdominal or pelvic radiation therapy when compared with placebo (34263).
• Radiation fibrosis. It is unclear if oral berberine is beneficial for reducing radiation-induced lung damage. Details: Preliminary clinical research shows that taking berberine 20 mg/kg once daily for 6 weeks during radiation therapy reduces the incidence of radiation-induced lung injury and improves lung function in patients treated for NSCLC when compared with placebo (34253).
• Stroke. It is unclear if oral berberine is beneficial in adults with acute ischemic stroke. Details: A meta-analysis of several small clinical studies in adults with acute ischemic stroke shows that taking berberine 0.3-1.0 grams daily for up to 6 months in addition to conventional therapy reduces stroke severity, as measured by the NIH Stroke Scale, improves markers of atherosclerosis and inflammation, and reduces triglycerides and low-density lipoprotein cholesterol when compared with routine therapy as control (111698). The validity of these findings is limited by the overall low quality of the included studies, with unclear blinding and randomization. Other limitations include significant heterogeneity in patient populations, berberine doses, and treatment durations studied.
• Thrombocytopenia. It is unclear if oral berberine is beneficial for improving platelet counts in people with this condition. Details: Preliminary clinical research shows that taking berberine bisulfate 5 mg three times daily before meals for 15 days, either alone or with prednisolone, can increase platelet count in patients with primary or secondary thrombocytopenia when compared with baseline (34317).
• Trachoma. It is unclear if berberine is beneficial for trachoma when administered as eye drops. Details: Preliminary clinical research shows that berberine ophthalmic solution might be useful for treating trachoma, a common cause of blindness in developing countries. Solutions of 0.2% berberine have been applied three times daily for 3-12 weeks, or solutions of 0.5% three times daily for 1-3 weeks (13523,34303,34310,34313).
• Ulcerative colitis. It is unclear if oral or rectal berberine is beneficial for ulcerative colitis. Details: A meta-analysis of several small, lower quality clinical studies in adults with ulcerative colitis shows that taking berberine orally (600-900 mg daily) or rectally (4-6 grams daily) for 3-12 weeks, in addition to mesalamine, improves the rate of patients with complete remission or reduced symptoms, such as bowel movements, blood in stools, or abdominal pain, when compared to mesalamine alone (115724). The validity of these findings is limited by heterogenous methods between clinical trials, including route of administration and treatment duration.
• Ventricular arrhythmias. Limited research suggests that oral berberine might lower the frequency of premature ventricular contractions (PVCs). Details: Data from a meta-analysis of 10 small clinical trials, all conducted in China, shows that taking oral berberine, 0.3-0.6 grams 3 or 4 times daily for 7-30 days has a similar efficacy rate to antiarrhythmic drugs, and a lower incidence of adverse effects, in the management of PVCs. A combination of berberine and antiarrhythmic drugs has a higher efficacy rate and similar adverse effect rate, when compared with antiarrhythmic drugs alone (112947). The quality of this evidence is low. More evidence is needed to rate berberine for these uses.

(Read more about BERBERINE)

POSSIBLY INEFFECTIVE

• Diabetes. Most research shows that oral Ceylon cinnamon does not benefit patients with type 2 diabetes. Details: Clinical research in adults with well-controlled type 2 diabetes shows that taking Ceylon cinnamon 1-9 grams orally daily for 2-3 months does not improve fasting blood glucose when compared with placebo or a control group (99436,99437,99439). However, one small clinical study in adults with poorly controlled type 2 diabetes despite treatment with metformin showed a trend toward improvement in fasting blood glucose. Taking Ceylon cinnamon 3 grams daily for 8 weeks reduced fasting blood glucose by 12 mg/dL, compared with an increase of 9 mg/dL in those taking placebo. Although this difference was not statistically significant, the study might not have been adequately powered to show a difference. Also, the 8-week duration of this study was too short to reliably assess the effect of Ceylon cinnamon on glycated hemoglobin (HbA1c) (99438). Conversely, a large study clinical study in patients with type 2 diabetes conducted in India shows that taking Ceylon cinnamon 1.5 grams daily for 4 months improves fasting blood glucose by 40 mg/dL and HbA1c by 1% when compared with placebo but does not significantly improve either outcome when compared to baseline (112422). However, it is unclear whether modifications to diabetes medications were allowed during the study.
• Obesity. Preliminary clinical research suggests that oral Ceylon cinnamon does not help with weight loss. Details: Preliminary clinical research shows that drinking black tea steeped with 3 grams of Ceylon cinnamon dried powder three times daily for 8 weeks does not affect weight, waist circumference, or blood pressure when compared with baseline or black tea alone in overweight patients with diabetes (95597). Other preliminary research shows that taking Ceylon cinnamon, titrated up from 85 mg to 500 mg, daily for 3 months has no effect on weight or body mass index, but may reduce hip circumference by 1.8 cm, when compared with baseline in healthy, mostly normal weight adults (97250).

INSUFFICIENT RELIABLE EVIDENCE to RATE

• Allergic rhinitis (hay fever). A nasal spray containing a Ceylon cinnamon extract might improve symptoms of allergic rhinitis. It is unclear if oral Ceylon cinnamon is beneficial. Details: Using a nasal spray containing a polyphenol-rich standardized extract of Ceylon cinnamon 1 mg/mL, twice daily in each nostril for 7 days, reduces the severity of nasal, eye, and nocturnal symptoms, and improves quality of life and work productivity when compared with placebo in people with seasonal allergic rhinitis who are not using any other medications for the condition (103169). One small clinical study in patients with seasonal allergic rhinitis shows that taking a specific combination product (ClearGuard, Access Business Group LLC) containing Ceylon cinnamon extract, acerola fruit concentrate, and powdered Spanish needles (Bidens pilosa) orally, 450 mg three times daily for 3 days, improves nasal symptoms 8 hours after, but not immediately following, a nasal allergen challenge when compared with placebo (23709).
• Chronic obstructive pulmonary disease (COPD). Ceylon cinnamon has only been studied in combination with other ingredients; its effect when used alone is unclear. Details: A moderate-sized clinical study in adults with COPD shows that taking a combination product containing extracts of Ceylon cinnamon, ginger, alpinia, cardamom, and saffron in honey 3 times daily for 8 weeks improves confidence in leaving home and the ratio of forced exploratory volume per second to forced vital capacity of the lungs (FEV1/FVC) when compared with placebo. However, the combination product does not improve most measures of respiratory function or symptoms such as cough, phlegm, chest tightness, dyspnea, reduced energy levels, sleeping disorders, or activity limitations when compared with placebo (111542). It is unclear if these effects are due to Ceylon cinnamon, other ingredients, or the combination.
• Common cold. Although there has been interest in using oral Ceylon cinnamon for the common cold, there is insufficient reliable information about the clinical effects of Ceylon cinnamon for this purpose.
• Denture stomatitis. It is unclear if topical Ceylon cinnamon is beneficial in patients with denture stomatitis. Details: A small clinical trial in patients with denture stomatitis shows that using 10 mL of a mouthwash, as well as a denture spray, containing Ceylon cinnamon essential oil three times daily for 15 days modestly reduces Candida measurements and improves the severity of stomatitis in the oral mucosa and dentures when compared with baseline (108262). The validity of these findings is limited by the lack of a comparator group.
• Diarrhea. Although there has been interest in using oral Ceylon cinnamon for diarrhea, there is insufficient reliable information about the clinical effects of Ceylon cinnamon for this purpose.
• Dysmenorrhea. It is unclear if oral Ceylon cinnamon is beneficial in patients with dysmenorrhea. Details: One preliminary clinical trial in adults with primary dysmenorrhea shows that taking Ceylon cinnamon orally 1 gram three times daily during the first 72 hours of menstruation over the course of two cycles decreases pain by 1.6 points on a 10-point visual analog scale when compared with placebo (99875). The use of a per-protocol analysis limits the validity of these results.
• Dyspepsia. It is unclear if oral Ceylon cinnamon is beneficial in patients with dyspepsia. Details: A small clinical trial in patients with functional dyspepsia shows that taking one capsule of Ceylon cinnamon oil, providing an unspecified dose, three times daily for 6 weeks does not improve symptoms of dyspepsia when compared with sesame oil as placebo (108263).
• Hypertension. It is unclear if oral Ceylon cinnamon is beneficial in patients with prehypertension. Details: A small clinical trial in patients with prehypertension shows that taking Ceylon cinnamon 500 mg three times daily for 90 days does not affect final blood pressure measurements when compared with placebo. However, there was a modest reduction in mean daytime systolic blood pressure when compared with placebo (108261).
• Impaired glucose tolerance (prediabetes). Although there has been interest in using oral Ceylon cinnamon for impaired glucose tolerance, there is insufficient reliable information about the clinical effects of Ceylon cinnamon for this purpose.
• Influenza. Although there has been interest in using oral Ceylon cinnamon for influenza, there is insufficient reliable information about the clinical effects of Ceylon cinnamon for this purpose.
• Intestinal parasite infection. Although there has been interest in using oral Ceylon cinnamon for intestinal parasite infection, there is insufficient reliable information about the clinical effects of Ceylon cinnamon for this purpose.
• Irritable bowel syndrome (IBS). Oral Ceylon cinnamon has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: Preliminary clinical research shows that taking a combination of powdered Ceylon cinnamon 1.5 grams, dried bilberry fruit 10 grams, slippery elm bark 4.5 grams, and agrimony 3 grams orally twice daily for 3 weeks increases the number of bowel movements and reduces symptoms such as abdominal pain, bloating, flatulence, and straining in patients with diarrhea-predominant IBS (35462).
• Migraine headache. It is unclear if oral Ceylon cinnamon is beneficial in patients with migraine headache. Details: Preliminary clinical research shows that taking Ceylon cinnamon powder orally 600 mg three times daily for 2 months, in addition to regular medications for migraine, decreases the frequency, severity, and duration of migraine attacks when compared with placebo (104520).
• Polycystic ovary syndrome (PCOS). It is unclear if oral Ceylon cinnamon is beneficial in patients with PCOS. Details: Taking Ceylon cinnamon orally 1.5 grams daily for 3 months in adults with PCOS does not appear to improve fasting insulin levels, fasting glucose levels, glycated hemoglobin, testosterone, lipid parameters, body weight, or body mass index when compared with placebo (97248). However, a meta-analysis of 5 low-quality studies shows that taking Ceylon cinnamon 0.5-1.5 grams daily for 8 weeks to 1 year reduces insulin resistance and fasting serum insulin levels (104518). Ceylon cinnamon has also been evaluated in combination with other ingredients. Some preliminary clinical research in overweight adults with PCOS shows that taking three tablets of a combination product containing extracts of Ceylon cinnamon, licorice root, peony root, and St. John's wort, providing the equivalent of 750 mg of dried herb for each ingredient, daily for 3 months, plus tribulus extract for 10 days during the follicular phase, in conjunction with lifestyle modification reduces the time between periods by around 43 days when compared with lifestyle modification alone. The rate of conception was four times higher with this combination when compared with control (97216). Another small clinical study shows that taking a mixture of Ceylon cinnamon, spearmint, ginger, and sweet orange daily for 3 months, in addition to clomiphene citrate for 5 days of each menstrual cycle, improves serum antioxidant levels, fasting blood glucose, and serum insulin levels when compared with clomiphene citrate alone. It is unclear whether these changes are associated with an increase in ovulation and pregnancy rates (103168). In both studies, it is unclear if the effects are related to Ceylon cinnamon, other ingredients, or to the combinations used.
• Premature ejaculation. Topical Ceylon cinnamon has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: In patients with premature ejaculation, applying a multi-ingredient cream (SS Cream) containing Panax ginseng root, Angelica root, Cistanches deserticola, Zanthoxyl species, Torlidis seed, clove flower, Asiasari root, Ceylon cinnamon, and toad venom to the glans penis one hour prior to intercourse and washing off immediately before intercourse improves ejaculatory latency when compared with placebo (2537). The effects of Ceylon cinnamon alone are unclear. More evidence is needed to rate Ceylon cinnamon for these uses.

(Read more about CEYLON CINNAMON)

POSSIBLY EFFECTIVE

• Diabetes. Oral fenugreek seed seems to improve glycemic control in type 2 diabetes. Details: Meta-analyses of 10-14 clinical trials in patients with type 2 diabetes or other metabolic conditions show that taking fenugreek lowers fasting glucose by approximately 14-23 mg/dL, 2-hour postprandial glucose by 21-23 mg/dL, and glycated hemoglobin (HbA1c) by 0.6-1.2% when compared with placebo. The most effective doses and formulations seem to include powdered seed or debitterized seed powder 5-100 grams daily, taken as capsules or added to meals, for up to 3 years or seed hydroalcoholic extract about 1 gram daily for up to 2 months (90112,96065,105016,111503,113499,112120). The validity of these effects is limited by high heterogeneity and low quality in the included studies. Most research also shows that fenugreek seed lowers total cholesterol levels and triglycerides in patients with diabetes, but has inconsistent effects on low-density lipoprotein (LDL) cholesterol and high-density lipoprotein (HDL) cholesterol (96065,102252). Some research shows that taking fenugreek in combination with other ingredients also seems to improve glycemic indices in people with diabetes. These combination products have combined fenugreek with guar gum and gymnema (10284) or millets and legumes (9784). Limited research has also evaluated fenugreek in type 1 diabetes. In one small clinical study, taking 50 grams of defatted fenugreek seed powder twice daily with meals for 10 days reduced 24-hour urine glucose levels by 54% when compared to baseline (622). The validity of this finding is limited by the lack of a comparator group.
• Dysmenorrhea. Oral fenugreek seed might help to reduce menstrual pain. Details: Clinical research in adults with moderate to severe dysmenorrhea shows that taking fenugreek seed powder 1800-2700 mg three times daily for the first 3 days of menstruation followed by 900 mg three times daily for the remainder of two menstrual cycles reduces pain severity when compared with placebo. Patients taking fenugreek seed powder showed a reduction in pain severity of 3.22, compared with a reduction of only 0.18 in the placebo group (90116).
• Sexual arousal. Oral fenugreek seed might help to improve sexual arousal. Details: Clinical research shows that taking a specific fenugreek seed extract (Testofen, Gencor Pacific Ltd) 600 mg daily for 12 weeks increases sexual function by 15% over baseline, compared with no change in the placebo group; the main benefits were in sexual arousal and drive. Morning erection and sexual frequency also improve by 2- to 3-fold (93419). Another clinical study in healthy males shows that taking the same fenugreek seed extract 600 mg daily in combination with magnesium 34 mg, zinc 30 mg, and vitamin B6 10 mg for 6 weeks, improves a composite of symptoms such as sexual cognition, sexual arousal, sexual behavior, and orgasm. The overall improvement in the composite score was 23%, compared with a worsening in the placebo group (93421).
• Sexual dysfunction. Oral fenugreek seed extract might help to improve sexual dysfunction. Details: Clinical research shows that taking a specific fenugreek seed extract (Libifem, Gencor Pacific Ltd.) 300 mg twice daily for two menstrual cycles improves sexual function in healthy pre-menopausal adults with low sex drive. In one clinical trial, overall improvement based on a composite of symptoms was 26% in the fenugreek group, compared with only 2% in the placebo group. Individual scores for sexual cognition, arousal, behavior, drive, and orgasm were all improved. Patients taking fenugreek also had an increased frequency of sexual activity from 1-2 times per month to once per week, compared to no change in the placebo group (93420). Other clinical research in males aged 35-60 years with symptomatic hypogonadism shows that taking a specific fenugreek seed extract (Furosap; Chemical Resources) 500 mg daily after breakfast for 12 weeks improves sexual arousal, mental alertness, and mood when compared with baseline. This fenugreek seed extract was fortified with 20% protodioscin; the other constituents were not specified (108700). The validity of this finding is limited by the lack of comparator group.

POSSIBLY INEFFECTIVE

• Benign prostatic hyperplasia (BPH). Oral fenugreek extract does not seem to improve BPH symptoms. Details: A clinical study in healthy adults with BPH shows that taking a specific fenugreek extract (Testofen, Bluegum Pharmaceuticals) 300 mg twice daily for 12 weeks does not improve BPH symptoms when compared with placebo (102253).

INSUFFICIENT RELIABLE EVIDENCE to RATE

• Alopecia areata. Although there is interest in using oral fenugreek for alopecia areata, there is insufficient reliable information about the clinical effects of fenugreek for this condition.
• Alzheimer disease. It is unclear if oral fenugreek seed extract is beneficial for Alzheimer disease. Details: A moderate-sized study in adults with mild to moderate Alzheimer disease shows that taking fenugreek seed extract 5 mL daily for 4 months modestly improves memory but does not improve depression or quality of life measures when compared with placebo (113498).
• Athletic performance. It is unclear if oral fenugreek seed is beneficial for improving athletic performance. Details: Two small clinical studies in resistance-trained young males shows that taking a fenugreek supplement (AI or Torabolic, Indus Biotech) 500 mg daily for 8 weeks in addition to training 4 days every week, decreases body fat by about 2% and sometimes increases leg and bench press performance, but does not improve power, when compared with placebo (18352,18353). Another small study in healthy males undergoing strength training also shows that taking a specific fenugreek extract enriched in furostanol glycosides (Fenu-FG, Indus Biotech Private Limited) 300 mg twice daily for 8 weeks might help to modestly increase the number of bench press repetitions, but not overall strength, when compared with placebo (93423).
• Atopic dermatitis (eczema). Although there is interest in using topical fenugreek for eczema, there is insufficient reliable information about the clinical effects of fenugreek for this condition.
• Cough. Although there is interest in using oral fenugreek for cough, there is insufficient reliable information about the clinical effects of fenugreek for this purpose.
• Gastroesophageal reflux disease (GERD). It is unclear if oral fenugreek fiber is beneficial for improving heartburn symptoms. Details: A small clinical study in patients with frequent heartburn shows that taking a specific fenugreek fiber product (FenuLife, Frutarom Belgium), 2 grams twice daily 30 minutes before the two biggest meals of the day, improves heartburn after one week of treatment and continuing through the 2-week study period. Fenugreek seemed to be similarly effective to ranitidine 75 mg twice daily (17372).
• Gout. Although there is interest in using topical fenugreek for gout, there is insufficient reliable information about the clinical effects of fenugreek for this condition.
• Hyperlipidemia. Small clinical studies suggest that oral fenugreek supplements might be beneficial for improving lipid levels. Details: Overall, fenugreek powdered seed seems to modestly reduce lipid levels in people with or without hyperlipidemia; however, most studies have been low-quality, small, and exploratory. Meta-analyses of these studies show that fenugreek reduces total cholesterol, low-density lipoprotein (LDL) cholesterol, and triglycerides, and increases high-density lipoprotein (HDL) cholesterol (103283,103284). Powdered fenugreek seed has been studied in doses of 0.5-100 grams daily for 10 days to 3 years. While some studies show modest improvement, others show no benefit (622,7389,9783,18359,18361,18362,102252,103283,103284,113497).
• Hypertension. Analysis of small clinical studies suggests that oral fenugreek might slightly improve systolic blood pressure (SBP). Details: A meta-analysis of 6 small clinical studies in healthy adults or those with diabetes, prediabetes, or metabolic syndrome shows that taking fenugreek seed 0.5-50 grams daily for 6-144 weeks reduces SBP by 3.5 mmHg but does not improve diastolic blood pressure (DBP) when compared with placebo. However, subgroup analysis suggests that taking fenugreek at a dose of 15 grams or more daily or for a duration of 12 weeks or less modestly reduces DBP (112110).
• Impaired glucose tolerance (prediabetes). It is unclear if oral fenugreek is beneficial in patients with prediabetes. Details: A small clinical study in adults with prediabetes shows that taking a specific fenugreek seed extract (Trigogen, Gencor Pacific Ltd.) 250 mg twice daily for 12 weeks reduces fasting blood glucose and postprandial blood glucose but not glycated hemoglobin (HbA1c), fasting insulin, or postprandial insulin when compared with placebo (113497). Another small clinical trial in patients with prediabetes shows that taking fenugreek seed extract 200 mg, bergamot extract 500 mg, and olive leaf extract 100 mg daily for 6 months does not improve glycated hemoglobin or fasting blood glucose when compared with placebo (102251).
• Joint pain. Although there is interest in using oral fenugreek for joint pain, there is insufficient reliable information about the clinical effects of fenugreek for this condition.
• Lactation. Small clinical studies suggest that oral fenugreek, either as a supplement or tea, might increase lactation. Details: A network meta-analysis of 4 small clinical trials shows that taking fenugreek shortly after delivery may modestly increase breast milk production when compared with placebo. Patients in the included studies took fenugreek 1-2 grams as capsules or tea up to 3 times daily for 21-244 days. In most cases, fenugreek treatment was initiated one or two days after delivery. However, fenugreek might be less beneficial for breast milk production when compared with the natural ingredients Indian borage or palm date (96067). Fenugreek has also been used in combination with other ingredients. A small clinical study suggests that drinking a specific herbal tea containing fenugreek. hibiscus, fennel, rooibos, vervain, raspberry, goat's rue, and fennel oil (Humana Still-Tee, Humana, Germany) 200 mL three times daily modestly increases milk production when compared with placebo (22569). Another study in exclusively breastfeeding parents of 2-month-old infants shows that eating lactation cookies containing fenugreek, oatmeal, brewer's yeast, and flaxseed meal daily for 30 days do not improve milk production, perceived insufficiency, or breastfeeding self-efficacy when compared with control (112116).
• Male infertility. It is unclear if oral fenugreek seed is beneficial for improving sperm quality in males with infertility. Details: A small clinical study in healthy male patients ages 20-30 years with oligospermia shows that taking fenugreek seed oil 12 macro drops orally three times daily for 4 months improves sperm count from 6.2 million to 20.1 million, increases sperm motility from 43% to 61%, and reduces sperm abnormality from 68% to 53% when compared with baseline. However, taking the remaining fenugreek seed components 10 grams three times daily for 4 months does not seem to have this effect (90119). The validity of this finding is limited by the lack of a comparator group.
• Menopausal symptoms. It is unclear if oral fenugreek seed is beneficial for improving menopausal symptoms. Details: A small clinical study in perimenopausal patients shows that taking a specific fenugreek seed extract (FenuSMART) 250 mg, standardized to protodioscin 10.3%, trigonelline 3.1%, and total saponin 42.6%, twice daily with meals for 42 days does not improve menopausal symptoms when compared with placebo. However, there was a non-significant trend to reduced hot flashes, night sweats, depression, and insomnia in the treatment group (105000). This study was funded by the supplement manufacturer.
• Metabolic syndrome. It is unclear if oral fenugreek seed is beneficial for metabolic syndrome. Details: A meta-analysis of 29 small clinical studies in healthy adults or those with type 2 diabetes or other metabolic conditions shows that taking fenugreek at doses ranging from 25 mg to 60 grams daily for up to 144 weeks reduces fasting blood glucose by 17 mg/dL, triglycerides by 20 mg/dL, waist circumference by 2.5 cm, and systolic blood pressure by 3.5 mmHg and increases high-density lipoprotein cholesterol by 3.5 mg/dL when compared with control. However, no effect was found on diastolic blood pressure or body mass index (113500).
• Muscle strength. It is unclear if oral fenugreek seed is beneficial for increasing muscle strength. Details: A small study in healthy, active males shows that taking fenugreek seed extract 400 mg or 500 mg daily for 60 days increases grip strength when compared with placebo (103285).
• Myalgia. Although there is interest in using topical fenugreek for myalgia, there is insufficient reliable information about the clinical effects of fenugreek for this condition.
• Obesity. Small clinical studies suggest that oral fenugreek seed or fiber may increase satiety and decrease caloric intake. Details: Two small clinical studies in overweight and normal weight males shows that taking fenugreek seed extract modestly reduces daily fat intake. At a dose of 392 mg three times daily for 2-6 weeks, fat intake is reduced by 13% to 17%. However, a lower dose of 196 mg three times daily appears to be ineffective. Neither of the doses affect weight, appetite, or satiety (18348,18349). Another small clinical study in obese adults shows that adding 8 grams of fenugreek fiber powder (FenuLife, Frutarom Inc) to a low-calorie beverage increases feelings of satiety and decreases hunger and lunchtime food intake. A lower dose of 4 grams appears to be less effective for reducing hunger but was considered to be more palatable (18350).
• Parkinson disease. It is unclear if oral fenugreek seed is beneficial for Parkinson disease symptoms. Details: One small clinical study in patients with Parkinson disease who are also using levodopa shows that taking fenugreek seed extract (Indus Biotech Private Limited, Pune) 300 mg twice daily for 6 months does not seem to improve behavioral or motor symptoms when compared with placebo (90113).
• Peptic ulcers. Although there is interest in using oral fenugreek for peptic ulcers, there is insufficient reliable information about the clinical effects of fenugreek for this condition.
• Polycystic ovary syndrome (PCOS). It is unclear if oral fenugreek seed is beneficial for PCOS. Details: A small clinical study in adults with symptomatic PCOS shows that adding a specific fenugreek seed extract (Goldarou Pharmaceutical Co.) 500 mg twice daily to metformin for 8 weeks does not improve insulin resistance, insulin sensitivity, or other symptoms when compared with placebo and metformin (90117). However, other small clinical studies in adults with PCOS show that taking another specific fenugreek seed extract (Furocyst, Cepham Inc.) 1000 mg, enriched with 40% furostanolic saponins, daily for 90 days is associated with a reduction in ovarian cyst size in 46% of patients, complete dissolution in 36% of patients, normalization of menstrual cycles in 71% to 80% of patients, and subsequent pregnancy in 12% of patients. Further, this extract appears to reduce mean cyst size by 42% to 45%, the number of cysts by 38%, ovary volume by 24% to 40%, and hirsutism by 27% while reducing luteinizing hormone, follicle-stimulating hormone, free testosterone, and prolactin and improving liver function and the severity of PCOS-associated ailments including insulin resistance and dyslipidemia (93422,112112,113502). The validity of some of these findings is limited by the lack of a comparator group. Furthermore, this study was funded by the supplement manufacturer.
• Vaginitis. There is limited evidence on the topical use of fenugreek cream in patients with atrophic vaginitis. Details: One small clinical study in postmenopausal patients with atrophic vaginitis shows that administration of 0.5 grams of fenugreek 5% cream intravaginally twice weekly for 12 weeks reduces symptoms of atrophic vaginitis and reduces vaginal pH when compared to baseline. However, fenugreek was not as effective as vaginal cream containing conjugated estrogens (103286). Another small clinical study in postmenopausal patients with vaginal atrophy shows that applying a fenugreek cream 5% intravaginally daily for 8 weeks seems to reduce dyspareunia and vaginal dryness and increase vaginal maturation when compared with a placebo cream (105023).
• Wound healing. Although there is interest in using topical fenugreek for wound healing, there is insufficient reliable information about the clinical effects of fenugreek for this purpose. More evidence is needed to rate fenugreek for these uses.

(Read more about FENUGREEK)

INSUFFICIENT RELIABLE EVIDENCE to RATE

• Diabetes. It is unclear if oral gymnema is beneficial for diabetes. Details: A meta-analysis of 10 small clinical studies in adults with type 2 diabetes shows that taking gymnema modestly reduces fasting and postprandial blood glucose levels, and also seems to reduce glycated hemoglobin (HbA1c), when compared to baseline. Gymnema may also modestly reduce total cholesterol and triglyceride levels. (110022). Another meta-analysis of 6 small clinical studies, that includes some of the same studies, also shows that taking gymnema modestly reduces fasting blood glucose, total cholesterol, and triglyceride levels when compared with diet or placebo. However, this analysis shows that gymnema does not improve HbA1c, oral glucose tolerance, or low-density lipoprotein cholesterol (112184). The validity of these analyses is limited by the inclusion of mostly low-quality studies that enrolled heterogeneous patient populations and employed varying gymnema dosing regimens of 0.4-10 grams daily, sometimes in conjunction with antidiabetes medications. In addition, many of the included studies were non-randomized and lacked a comparator group.
• Impaired glucose tolerance (prediabetes). It is unclear if oral gymnema is beneficial for impaired glucose tolerance. Details: One small clinical study in overweight or obese patients with impaired glucose tolerance shows that taking gymnema (Swanson Superior Herbs) 300 mg twice daily for 12 weeks does not improve glucose control, lipid profile, anthropometric indices, or blood pressure when compared with placebo (105346). However, this study may have been inadequately powered to detect a difference between groups.
• Metabolic syndrome. It is unclear if oral gymnema is beneficial for metabolic syndrome. Details: One small clinical study shows that taking gymnema leaf (Swanson Premium G. sylvestre leaf, Swanson Health Products) 300 mg twice daily for 12 weeks reduces body weight by 4% and body mass index (BMI) by 2% when compared to baseline in overweight adults with metabolic syndrome. However, it is unclear if these changes are significant when compared with placebo. In addition, gymnema does not appear to improve blood glucose levels, insulin sensitivity, or blood lipid levels when compared with placebo (96235).
• Obesity. It is unclear if oral gymnema improves weight loss in overweight or obese adults. Details: One small clinical study shows that taking gymnema leaf (Swanson Premium G. sylvestre leaf, Swanson Health Products) 300 mg twice daily for 12 weeks modestly reduces body weight and body mass index (BMI) when compared to baseline in overweight adults with metabolic syndrome. However, it is unclear if these changes are significant when compared with placebo (96235). Another small clinical study by the same authors evaluating overweight adults with impaired glucose tolerance shows that taking gymnema (Swanson Superior Herbs) 300 mg twice daily for 12 weeks does not reduce body weight or BMI when compared with placebo (105346). Gymnema has also been studied in combination with other ingredients. One small clinical study shows that taking a combination of gymnema extract 400 mg, hydroxycitric acid 2800 mg, and niacin-bound chromium 4 mg orally daily for 8 weeks decreases BMI and body weight when compared to baseline in overweight and obese adults. This product provided 400 mcg of elemental chromium and 100 mg of gymnemic acids (42604). It is unclear if these effects are due to gymnema, other ingredients, or the combination. More evidence is needed to rate gymnema for these uses.

(Read more about GYMNEMA)

POSSIBLY SAFE ...when used orally and appropriately. Berberine has been used safely in doses up to 1.5 grams daily for 6 months (262,13520,20579) (34317,34228,34247,34253,34262,34263,34265,34267,34277,34282), (34283,34286,34287,34289,34293,34301,34305,34306,34319,34325)(99920,99921,103194) or up to 1 gram daily for 24 months (99921,103197). ...when used topically. Berberine ointment has been applied with apparent safety for up to 20 days (13526).

CHILDREN: LIKELY UNSAFE
when used orally in newborns. Berberine can cause kernicterus, particularly in preterm neonates with hyperbilirubinemia (2589). It is unclear if berberine is safe in older children.

PREGNANCY: LIKELY UNSAFE
when used orally. Berberine is thought to cross the placenta and may cause harm to the fetus. Kernicterus has developed in newborn infants exposed to berberine (2589). Also, berberine may stimulate uterine contractions (91951).

LACTATION: LIKELY UNSAFE
when used orally. Berberine can be transferred to the infant through breast milk (2589).

(Read more about BERBERINE)

LIKELY SAFE ...when consumed in amounts commonly found in foods. Ceylon cinnamon has Generally Recognized As Safe (GRAS) status in the US for use as a spice or flavoring agent (4912).

POSSIBLY SAFE ...when used orally and appropriately in medicinal amounts. Ceylon cinnamon 0.5-3 grams daily has been safely used in studies lasting up to 6 months (4,12,97248,97250,99874). ...when used as a mouth rinse for up to 15 days (92071). There is insufficient reliable information available about the safety of Ceylon cinnamon when used orally in greater amounts or for longer periods. Ceylon cinnamon contains trace amounts of coumarin (108260). In very high doses, coumarin can cause hepatotoxicity (15302). However, since the amount of coumarin in Ceylon cinnamon is negligible, it is unlikely to cause toxic effects (89652,92072,92073).

PREGNANCY: LIKELY SAFE
when consumed in amounts commonly found in foods (4912).

PREGNANCY: LIKELY UNSAFE
when used orally in amounts greater than those found in foods. Fetal abnormalities have been reported in animals (4,12).

LACTATION: LIKELY SAFE
when consumed in amounts commonly found in foods (4912). There is insufficient reliable information available about the safety of Ceylon cinnamon in amounts greater than those found in foods.

(Read more about CEYLON CINNAMON)

LIKELY SAFE ...when used orally in amounts commonly found in foods. Fenugreek has Generally Recognized as Safe (GRAS) status in the US (4912).

POSSIBLY SAFE ...when the seed is used orally in medicinal amounts. Fenugreek seed powder 5-10 grams daily has been used with apparent safety for up to 3 years. Fenugreek seed extract 1 gram daily has been used with apparent safety for up to 3 months (7389,9783,18359,18362,49868,90112,90113,90117,93419,93420)(93421,93422,93423,96065,103285,108704).

CHILDREN: LIKELY SAFE
when used orally in amounts commonly found in foods (4912). There is insufficient reliable information available about the safety of fenugreek when used in larger amounts. Unusual body and urine odor has been reported after consumption of fenugreek tea. Although the odor appears to be harmless, it may be misdiagnosed as maple syrup urine disease (9782,96068).

PREGNANCY: LIKELY UNSAFE
when used orally in amounts greater than those found in food. Fenugreek has potential oxytoxic and uterine stimulant activity (12531). There are case reports of congenital malformations, including hydrocephalus, anencephaly, cleft palate, and spina bifida, after consumption of fenugreek seeds during pregnancy (96068). Consumption of fenugreek immediately prior to delivery may cause the neonate to have unusual body odor. Although this does not appear to cause long-term sequelae, it may be misdiagnosed as maple syrup urine disease (9781,96068).

LACTATION: POSSIBLY SAFE
when used orally to stimulate lactation, short-term. Although most available clinical studies lack safety testing in the lactating parent or infant (12535,22569,22570), some evidence suggests that taking fenugreek 1725 mg three times daily orally for 21 days does not cause negative side effects in the infant (90115).

(Read more about FENUGREEK)

POSSIBLY SAFE ...when used orally and appropriately. Gymnema leaf extract has been used safely in doses of 200 mg twice daily for up to 20 months or 300 mg twice daily for 12 weeks (45,46,42604,105346).

PREGNANCY AND LACTATION:
Insufficient reliable information available; avoid using.

(Read more about GYMNEMA)

ANTICOAGULANT/ANTIPLATELET DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = D Theoretically, berberine might increase the risk of bleeding when used with anticoagulant or antiplatelet drugs.  Details In vitro and in vivo research suggest that berberine can inhibit platelet aggregation (33660,33694). Theoretically, berberine might have additive effects when used with anticoagulant and antiplatelet drugs and increase the risk of bleeding.

ANTIDIABETES DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, berberine may increase the risk of hypoglycemia when taken with antidiabetes drugs.  Details Clinical research shows that berberine may lower blood glucose levels (20579,34247,34265,34282,111363). Theoretically, berberine might have additive effects with antidiabetes drugs and increase the risk of hypoglycemia.

ANTIHYPERTENSIVE DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, berberine might have additive effects with antihypertensive drugs.  Details Animal research suggests that berberine can have hypotensive effects (33692,34308). Also, a clinical study suggests that taking berberine in combination with amlodipine can lower systolic and diastolic blood pressure when compared with amlodipine alone (91956).

CNS DEPRESSANTS Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = D Theoretically, berberine might increase the sedative effects of CNS depressants.  Details Animal research suggests that berberine may have sedative effects (13519,33650,33664,33692). Theoretically, use of berberine along with CNS depressants might produce additive therapeutic and adverse effects.

CYCLOSPORINE (Neoral, Sandimmune) Interaction Rating = Major Do not take this combination. Severity = High •  Occurrence = Probable •  Level of Evidence = A Berberine can increase serum levels of cyclosporine.  Details Berberine can reduce metabolism and increase serum levels of cyclosporine. Berberine might inhibit cytochrome P450 3A4 (CYP3A4), which metabolizes cyclosporine (13524,21112,34239).

CYTOCHROME P450 2C9 (CYP2C9) SUBSTRATES Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = B Theoretically, berberine might increase serum levels of drugs metabolized by CYP2C9.  Details Preliminary clinical research shows that berberine can inhibit CYP2C9 (34279). Theoretically, taking berberine with drugs metabolized by CYP2C9 might increase drug levels and increase the risk of adverse effects.

CYTOCHROME P450 2D6 (CYP2D6) SUBSTRATES Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = B Theoretically, berberine might increase serum levels of drugs metabolized by CYP2D6.  Details In vitro research and preliminary clinical evidence show that berberine can inhibit CYP2D6 (21117,34279,34297). Theoretically, use of berberine with drugs metabolized by CYP2D6 might increase drug levels and increase the risk of adverse effects.

CYTOCHROME P450 3A4 (CYP3A4) SUBSTRATES Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = A Theoretically, berberine might increase serum levels of drugs metabolized by CYP3A4.  Details In vitro research and preliminary clinical research show that berberine moderately inhibits CYP3A4 (13524,21114,34279,34297). Theoretically, use of berberine with drugs metabolized by CYP3A4 might increase drug levels and increase the risk of adverse effects.

DEXTROMETHORPHAN (Robitussin DM, others) Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = B Theoretically, berberine may increase serum levels of dextromethorphan.  Details Preliminary clinical research shows that berberine can inhibit cytochrome P450 2D6 (CYP2D6) activity and reduce the metabolism of dextromethorphan (34279). This may increase the effects and side effects of dextromethorphan.

LOSARTAN (Cozaar) Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = B Berberine might reduce the therapeutic effects of losartan by decreasing its conversion to its active form.  Details Preliminary clinical research suggests that berberine can inhibit cytochrome P450 2C9 (CYP2C9) activity and reduce metabolism of losartan (34279).

METFORMIN (Glucophage) Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, berberine might increase the therapeutic and adverse effects of metformin.  Details In vitro and animal studies show that berberine can increase the systemic exposure and half-life of metformin, potentially increasing metformin's effects and side effects. This interaction seems to be most apparent when berberine is administered 2 hours prior to metformin. Taking berberine and metformin at the same time does not appear to increase systemic exposure to metformin (103195).

MIDAZOLAM (Versed) Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = B Berberine can reduce metabolism of midazolam, which might increase the risk of severe adverse effects.  Details Preliminary clinical research shows that berberine can inhibit cytochrome P450 3A4 (CYP3A4) activity and reduce metabolism of midazolam (34279).

PENTOBARBITAL (Nembutal) Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = D Berberine might increase the sedative effect of pentobarbital.  Details Evidence from animal research shows that berberine can prolong pentobarbital-induced sleeping time (13519). Theoretically, combining berberine and pentobarbital might increase the sedative effects of pentobarbital.

TACROLIMUS (Prograf) Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = D Berberine has been associated with increased blood levels of tacrolimus.  Details In a 16-year-old patient with idiopathic nephrotic syndrome who was being treated with tacrolimus 6.5 mg twice daily, intake of berberine 200 mg three times daily increased the blood concentration of tacrolimus from 8 to 22 ng/mL. Following a reduction of the tacrolimus dose to 3 mg daily, blood levels of tacrolimus decreased to 12 ng/mL (91954).

(Read more about BERBERINE)

ANTIDIABETES DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, Ceylon cinnamon may have additive effects with antidiabetes drugs.  Details Ceylon cinnamon may lower blood glucose levels (11247,11248,11973). Dose adjustments might be necessary.

ANTIHYPERTENSIVE DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, Ceylon cinnamon might have additive effects with antihypertensive drugs and increase the risk of hypotension.  Details Animal research shows that Ceylon cinnamon extract has vasorelaxant properties and reduces blood pressure in rat models of hypertension, possibly via inhibition of calcium influx through L-type voltage-sensitive channels (92085,92086).

(Read more about CEYLON CINNAMON)

ANTICOAGULANT/ANTIPLATELET DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Unlikely •  Level of Evidence = B Theoretically, fenugreek might have additive effects when used with anticoagulant or antiplatelet drugs.  Details Some of the constituents in fenugreek have antiplatelet effects in animal and in vitro research. However, common fenugreek products might not contain sufficient concentrations of these constituents for clinical effects. A clinical study in patients with coronary artery disease or diabetes shows that taking fenugreek seed powder 2.5 grams twice daily for 3 months does not affect platelet aggregation, fibrinolytic activity, or fibrinogen levels (5191,7389,49643).

ANTIDIABETES DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Probable •  Level of Evidence = B Theoretically, fenugreek seed might have additive hypoglycemic effects when used with antidiabetes drugs.  Details Clinical research shows that fenugreek seed can reduce fasting blood glucose and 2-hour postprandial glucose levels in adults with type 2 diabetes (10284,90112,96065,105016).

CLOPIDOGREL (Plavix) Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, fenugreek seed might alter the clinical effects of clopidogrel by inhibiting its conversion to the active form.  Details Animal research shows that fenugreek seed 200 mg/kg daily for 14 days increases the maximum serum concentration of clopidogrel by 21%. It is unclear how this affects the pharmacokinetics of the active metabolite of clopidogrel; however, this study found that concomitant use of fenugreek seed and clopidogrel prolonged bleeding time by an additional 11% (108701).

METOPROLOL (Toprol) Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Probable •  Level of Evidence = B Theoretically, fenugreek seed might have additive hypotensive effects when used with metoprolol.  Details Animal research shows that fenugreek seed 300 mg/kg daily for 2 weeks decreases systolic and diastolic blood pressure by 9% and 11%, respectively, when administered alone, and by 15% and 22%, respectively, when given with metoprolol 10 mg/kg (108703).

PHENYTOIN (Dilantin) Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, fenugreek might decrease plasma levels of phenytoin.  Details Animal research shows that taking fenugreek seeds for 1 week decreases maximum concentrations and the area under the curve of a single dose of phenytoin by 44% and 72%, respectively. This seems to be related to increased clearance (110905). So far, this interaction has not been reported in humans.

SILDENAFIL (Viagra) Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, concurrent use of sildenafil and fenugreek might reduce levels and therapeutic effects of sildenafil.  Details Animal research shows that taking fenugreek seeds for 1 week reduces maximum concentrations and the area under the curve of a single dose of sildenafil by 27% and 48%, respectively (110898). So far, this interaction has not been reported in humans.

THEOPHYLLINE Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, fenugreek may reduce the levels and clinical effects of theophylline.  Details Animal research shows that fenugreek 50 grams daily for 7 days reduces the maximum serum concentration (Cmax) of theophylline by 28% and the area under the plasma drug concentration-time curve (AUC) by 22% (90118).

WARFARIN (Coumadin) Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = D Theoretically, fenugreek might have additive effects with warfarin and increase the international normalized ratio (INR).  Details Some fenugreek constituents have antiplatelet effects, although these might not be present in concentrations that are clinically significant (7389). In one case report, a patient taking warfarin experienced an increased INR when starting to take fenugreek in combination with boldo (5191).

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ANTIDIABETES DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Probable •  Level of Evidence = B Theoretically, taking gymnema with antidiabetes drugs might increase the risk of hypoglycemia.  Details Gymnema reduces blood glucose levels in some human and animal research. In human studies, it has been shown to enhance the blood glucose lowering effects of hypoglycemic drugs (45,46,92119,92121,92123). However, other research in adults with prediabetes or metabolic syndrome suggests that gymnema does not reduce fasting levels of blood glucose (96235,105346). Until more is known, monitor blood glucose levels closely.

CYTOCHROME P450 1A2 (CYP1A2) SUBSTRATES Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, gymnema might increase levels of drugs metabolized by CYP1A2.  Details Animal and in vitro research shows that gymnema can inhibit the CYP1A2 enzyme (96236,96237,96238). In one animal study, oral administration of gymnema for 7 days increased the plasma concentrations of phenacetin, a CYP1A2 substrate, by about 1.4-fold and reduced the clearance of phenacetin by about 29% (96237).

CYTOCHROME P450 2C9 (CYP2C9) SUBSTRATES Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, gymnema might increase or decrease levels of drugs metabolized by CYP2C9.  Details Animal research shows that gymnema can induce the CYP2C9 enzyme. In one animal study, gymnema caused a 2.4-fold increase in the clearance of tolbutamide, a CYP2C9 substrate, in rats (96237). In vitro research also shows that gymnema can inhibit CYP2C9 (96236,96238).

CYTOCHROME P450 3A4 (CYP3A4) SUBSTRATES Interaction Rating = Minor Be watchful with this combination. Severity = Moderate •  Occurrence = Unlikely •  Level of Evidence = D Theoretically, gymnema might increase levels of drugs metabolized by CYP3A4.  Details One in vitro study using rat liver microsomes shows that gymnema can modestly inhibit the CYP3A4 enzyme (96238). However, other in vitro research using human liver microsomes shows that gymnema does not affect CYP3A4 activity (96236). Animal research also shows that gymnema does not alter the function of CYP3A4. In one study in rats, oral administration of gymnema for 7 days did not alter the clearance of amlodipine, a CYP3A4 substrate (96237).

PHENACETIN Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, taking gymnema with phenacetin might increase the levels of phenacetin.  Details Animal research shows that gymnema, administered orally for 7 days, decreases the clearance of phenacetin in a dose-dependent manner by about 21% to 29% and increases plasma levels about 1.3- to 1.4-fold when compared to control (96237,96238).

TOLBUTAMIDE (Orinase) Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, taking gymnema with tolbutamide might the decrease levels of tolbutamide.  Details Animal research shows that gymnema, administered orally for 7 days, increases the clearance of tolbutamide by 2.4-fold when compared to control (96237).

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General ...Orally, berberine is generally well tolerated.
Most Common Adverse Effects:
Orally: Abdominal pain and distension, constipation, diarrhea, flatulence, nausea, vomiting.
Intravenously: Facial flushing, painful swelling at the injection site.
Serious Adverse Events (Rare):
Intravenously: Ventricular tachycardia consistent with torsades de pointes.

Cardiovascular ...In four of 12 patients with refractory congestive heart failure, intravenous infusion of berberine at a rate of 0. 2 mg/kg per minute caused ventricular tachycardia consistent with torsades de pointes (33642).

Dermatologic ...When administered intravenously, berberine can cause painful swelling at the injection site or facial flushing (34330). In three of 12 people injected subcutaneously with berberine, permanent hyperpigmentation at the injection site occurred (33698).
Orally, berberine may cause rash, but this event appears to be rare (34285,110106).

Endocrine ...Orally, berberine may cause hypoglycemia (111363).

Gastrointestinal ...Orally, berberine may cause diarrhea, constipation, flatulence, nausea, vomiting, abdominal pain, abdominal distention, gastroesophageal reflux, and bitter taste (33648,33689,34245,34247,34285,91953,99920,99921,103194,103197)(110106,111363,111699,113462,114769).

Hepatic ...Orally, berberine may occasionally cause an increase in transaminases (99921,103194). However, meta-analyses have found no significant effect of berberine on alanine aminotransferase (ALT) or aspartate aminotransferase (AST) (104508,111363).

Musculoskeletal ...Reports of mild muscle pain and muscle weakness have been reported following the use of a combination product containing berberine, policosanol, red yeast rice, folic acid, coenzyme Q10, and astaxanthin (34283). It is unclear if these effects are due to berberine or other constituents.

Neurologic/CNS ...Orally, berberine may cause dizziness, drowsiness, fatigue, and headache (33648,99921,113462).

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General ...Orally, Ceylon cinnamon is generally well tolerated, and adverse reactions are uncommon.
Most Common Adverse Effects:
Orally: Bloating, dyspepsia, nausea.
Topically: Allergic dermatitis, irritation of mucous membranes and skin.

Dermatologic ...Orally, a case of systemic contact dermatitis has been reported in a patient who consumed cinnamon (type not specified) after being previously sensitized to cinnamyl alcohol via cutaneous exposure (95599). In a small study of oral Ceylon cinnamon, two patients reported itching (104520). In another small study, two patients reported rashes (108263).
Topically, cinnamon oil can cause skin irritation and allergic dermatitis, probably due to cinnamaldehyde which makes up 60% to 80% of cinnamon oil (2537,12635,92071,95596,95599). In one case report, a 16-year-old female experienced worsening dermatitis after using a homemade facial scrub containing cinnamon powder (type not specified). Symptoms improved after discontinuation of the scrub (95596). Several cases of intraoral allergic contact dermatitis have been reported in patients consuming cinnamon (type not specified) or using products containing constituents of cinnamon (95598).

Gastrointestinal ...Orally, gastrointestinal side effects such as heartburn, nausea, bloating, and dyspepsia have been reported (97250).

Hematologic ...Orally, a case of postoperative hemorrhage is reported in a 49-year-old patient after taking Ceylon cinnamon 1 tablespoon daily for 10 months. One day post-colectomy, the patient had an INR of 1.59 and intraabdominal bleeding that required exploratory laparotomies, blood transfusion, and fresh frozen plasma. Ultimately, the patient was discharged (112421).

Hepatic ...While there is concern about the coumarin content in cassia cinnamon increasing the risk for hepatic adverse effects and bleeding, the amount of coumarin in Ceylon cinnamon is negligible and unlikely to cause toxic effects (89652,92072,92073). In one case report, a 73-year-old female taking rosuvastatin for several months developed elevated liver function tests (LFTs), abdominal pain, nausea, and vomiting after taking cinnamon (unknown dose and type) for 7 days. The acute hepatitis and elevated LFTs resolved after stopping both cinnamon and rosuvastatin. The patient was later able to resume rosuvastatin without recurrence (97249).

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General ...Orally, fenugreek seed is generally well tolerated.
Most Common Adverse Effects:
Orally: Abdominal pain, bloating, diarrhea, dyspepsia, flatulence, hypoglycemia, and nausea.
Serious Adverse Effects (Rare):
All ROA: Severe allergic reactions including angioedema, bronchospasm, and shock.

Endocrine ...Orally, large doses of fenugreek seed, 100 grams daily of defatted powder, have caused hypoglycemia (164,96068).

Gastrointestinal ...Orally, fenugreek seed can cause mild gastrointestinal symptoms, such as diarrhea, dyspepsia, abdominal distention and pain, nausea, and flatulence, especially when taken on an empty stomach (622,12534,18349,93421,96065,96068,105016).

Immunologic ...Fenugreek can cause allergic reactions when used orally and topically, and when the powder is inhaled (719,96068). Orally, fenugreek has caused bronchospasm, diarrhea, and itching, and skin reactions severe enough to require intravenous human immunoglobulin (96068). Topically, fenugreek paste has resulted in facial swelling, wheezing, and numbness around the head (719,96068). When used both orally and topically by a single individual, asthma and rhinitis occurred (96068). Inhalation of fenugreek powder has resulted in fainting, sneezing, runny nose, and eye tearing (719,96068).

Neurologic/CNS ...Orally, loss of consciousness has occurred in a 5 week-old infant drinking tea made from fenugreek (9782). Dizziness and headaches have been reported in clinical research of fenugreek extract (49551,93419). However, these events are rare.

Renal ...Orally, fenugreek aqueous see extract may increase the frequency of micturition, although this even appears to be rare (49551).

Other ...Consumption of fenugreek during pregnancy, immediately prior to delivery, may cause the neonate to have an unusual body odor, which may be confused with maple syrup urine disease. It does not appear to cause long-term sequelae (9781). This unusual body odor may also occur in children drinking fenugreek tea. A case of a specific urine and sweat smell following oral fenugreek extract use has been reported for a patient in one clinical trial (18349).
In 2011, outbreaks of enteroaggregative hemorrhagic Escherichia coli (EATEC) O104:H4 infection occurred in Germany and Spain. Epidemiological studies linked the outbreaks to fenugreek seeds that had been imported from Africa. However, laboratory analyses were unable to isolate the causative strain of bacteria from fenugreek seed samples (49776,49777,49781,90114).

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General ...Orally, gymnema seems to be well tolerated.

Hepatic ...A case of drug-induced hepatitis characterized by weakness, fatigue, jaundice, and elevated liver enzymes, has been reported for a patient who consumed gymnema tea three times daily for 10 days. The patient was administered prednisone 60 mg once daily and was eventually tapered off prednisone and discharged. Laboratory values normalized after 6 months (95005). A case of hepatitis-associated aplastic anemia characterized by jaundice, elevated liver function tests, and pancytopenia has been reported for a patient who consumed gymnema 2 grams twice daily for at least a month. Treatment with ursodeoxycholic acid for 8 weeks led to resolution of cholestatic hepatitis; however, the pancytopenia was not responsive to treatment with immunosuppressive drugs and the patient died 5 months after presentation (110021). The exact reason for these adverse effects is not clear; they may have been idiosyncratic.

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