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INSUFFICIENT RELIABLE EVIDENCE to RATE

• Alzheimer disease. Although there has been interest in using oral green coffee for Alzheimer disease, there is insufficient reliable information about the clinical effects of green coffee for this condition.
• Diabetes. Although there has been interest in using oral green coffee for diabetes, there is insufficient reliable information about the clinical effects of green coffee for this condition.
• Hypercholesterolemia. It is unclear if oral green coffee is beneficial for hypercholesterolemia. Details: A meta-analysis of small clinical trials shows that taking green coffee extract modestly reduces levels of total and low-density lipoprotein (LDL) cholesterol, and increases levels of high-density lipoprotein (HDL), when compared to placebo. There was no effect on triglyceride levels (111048). These changes are unlikely to be clinically significant. In addition, this analysis is limited by the significant heterogeneity of the patient populations and any effect of green coffee extract in patients with hyperlipidemia is unclear. A small preliminary clinical study included in this meta-analysis in patients with hypercholesterolemia shows that drinking a beverage containing soluble green coffee 0.7 grams and soluble roasted coffee 1.3 grams (containing chlorogenic acids 148.4 mg per serving) three times daily for 8 weeks reduces LDL cholesterol, total cholesterol, and triglycerides when compared with baseline (103957). The validity of this finding is limited by the lack of a comparator group. Furthermore, it is unclear if the benefits are due to green coffee, roasted coffee, or the combination.
• Hypertension. It is unclear if oral green coffee extract is beneficial for lowering blood pressure. Details: Two small clinical studies in Japanese adults with mild, untreated hypertension show that taking green coffee extracts providing 50-140 mg chlorogenic acids daily for 4-12 weeks reduces systolic blood pressure by 5-10 mmHg and diastolic blood pressure by 3-7 mmHg when compared with placebo (17971,17972).
• Metabolic syndrome. Oral green coffee extract seems to improve some, but not all, measures of metabolic syndrome. Details: In patients with metabolic syndrome, clinical research shows that taking green coffee extract (Arjuna Natural Extracts Ltd) 400 mg twice daily for 8 weeks improves some measures of metabolic syndrome when compared with placebo. Systolic blood pressure, fasting blood glucose, insulin resistance, and waist circumference were reduced by a small amount, but there was no effect on glycated hemoglobin, lipid profile, or diastolic blood pressure (104831).
• Obesity. Oral green coffee extract may have a small effect on weight loss. Details: A meta-analysis of 13 clinical studies in patients with overweight or obesity shows that taking either green coffee extract 90-1000 mg, containing chlorogenic acids 30-500 mg, or pure chlorogenic acid 1200 mg daily for 8-12 weeks reduces weight by about 2 kg and body mass index (BMI) by 0.56 kg/m2 when compared with placebo (103954). Individual clinical studies have used a specific green coffee extract (Svetol, Naturex) (17982,17983). In the meta-analysis, there was no clear dose-response relationship (103954). This weight loss is unlikely to be clinically significant. In addition, this analysis is limited by the significant heterogeneity of the included studies and patient populations. In 2014 a trial reporting efficacy of a green coffee extract for treatment of obesity was determined to be "seriously flawed" by the Federal Trade Commission (FTC), resulting in its retraction by the authors and payment of a significant fine by the sponsoring company (Applied Food Sciences, Inc.) (88168,88169). This flawed study was not included in the 2020 meta-analysis (103954). In contrast to these findings, some clinical research has shown that taking green coffee does not reduce body weight. In one study, taking polyphenols 300 mg twice daily alone or in combination with oat-derived beta-glucans does not affect body weight or body composition when compared to baseline (109208). Also, in overweight or obese patients with breast cancer, a small clinical trial shows that taking green coffee extract (Arjuna Natural Extracts Ltd) 400 mg twice daily for 12 weeks does not affect body weight, body composition, or glycemic indices, when compared with placebo (111046).
• Polycystic ovary syndrome (PCOS). It is unclear if oral green coffee extract is beneficial for PCOS. Details: A small clinical trial in patients with PCOS shows that taking green coffee extract (Bonyan Salamat Kasra Company, Iran) 400 mg daily for 6 weeks modestly decreases total cholesterol and triglyceride levels when compared with taking placebo. However, there was no effect on glycemic indices, low-density lipoprotein (LDL) cholesterol, high-density lipoprotein (HDL) cholesterol, or body weight (111047). More evidence is needed to rate green coffee for these uses.

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POSSIBLY SAFE ...when used orally and appropriately. Green coffee extracts taken in doses up to 1000 mg daily, providing up to 500 mg chlorogenic acid, have been used with apparent safety for up to 12 weeks in clinical research (17971,17972,103954). A specific green coffee extract (Svetol, Naturex) has been used with apparent safety in doses up to 200 mg five times daily for up to 12 weeks (17981,17982,17983). Green coffee also contains caffeine, although in lower amounts than regular coffee. One cup of green coffee contains about 20-50 mg of caffeine, compared with about 100 mg in one cup of regular coffee. According to a review by Health Canada, and a subsequent large meta-analysis conducted in the US, doses of caffeine up to 400 mg daily are not associated with significant adverse cardiovascular, bone, behavioral, or reproductive effects in healthy adults (11733,98806). The US Dietary Guidelines Advisory Committee states that there is strong and consistent evidence that consumption of caffeine 400 mg daily is not associated with increased risk of major chronic diseases, such as cardiovascular disease or cancer, in healthy adults (98806). Keep in mind that only the amount of ADDED caffeine must be stated on product labels. The amount of caffeine found in ingredients such as green coffee, which naturally contains caffeine, does not need to be provided. This can make it difficult to determine the total amount of caffeine in a given product.

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

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ADENOSINE (Adenocard) Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, green coffee might decrease the vasodilatory effects of adenosine and interfere with its use prior to stress testing.  Details Green coffee can contain caffeine. Caffeine is a competitive inhibitor of adenosine at the cellular level. However, caffeine does not seem to affect supplemental adenosine because high interstitial levels of adenosine overcome the antagonistic effects of caffeine (11771). It is recommended that methylxanthines such as caffeine, as well as methylxanthine-containing products, be stopped 24 hours prior to pharmacological stress tests (11770). However, methylxanthines appear more likely to interfere with dipyridamole (Persantine) than adenosine-induced stress testing (11771).

ALCOHOL (Ethanol) Interaction Rating = Minor Be watchful with this combination. Severity = Mild •  Occurrence = Possible •  Level of Evidence = D Theoretically, alcohol might increase the levels and adverse effects of caffeine.  Details Green coffee can contain caffeine. Concomitant use of alcohol can increase caffeine serum concentrations and the risk of caffeine adverse effects. Alcohol reduces caffeine metabolism (6370,24693).

ALENDRONATE (Fosamax) Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Probable •  Level of Evidence = D Theoretically, green coffee may decrease the levels and effects of alendronate.  Details In human research, drinking coffee with alendronate reduces the bioavailability of alendronate by 60% (11735). Whether green coffee reduces the bioavailability of alendronate has not been investigated. Separate green coffee ingestion and alendronate administration by two hours.

ANTICOAGULANT/ANTIPLATELET DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Unlikely •  Level of Evidence = D Theoretically, green coffee may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.  Details Green coffee can contain caffeine. Caffeine is reported to have antiplatelet activity (8028,8029). Theoretically, caffeine in green coffee might increase the risk of bleeding when used concomitantly with these agents. However, this interaction has not been reported in humans. There is some evidence that caffeinated coffee might increase the fibrinolytic activity in blood (8030).

ANTIDIABETES DRUGS Interaction Rating = Minor Be watchful with this combination. Severity = Moderate •  Occurrence = Unlikely •  Level of Evidence = B Theoretically, taking green coffee and antidiabetes drugs might interfere with blood glucose control.  Details In clinical research, green coffee extract results in modest reductions in blood glucose levels in various populations (17982,19327,111049). However, other reports claim that caffeine might increase or decrease blood sugar levels (6024,8646,19329,19330,19331,19332).

ANTIHYPERTENSIVE DRUGS Interaction Rating = Minor Be watchful with this combination. Severity = Mild •  Occurrence = Possible •  Level of Evidence = B Theoretically, taking green coffee with antihypertensive drugs might increase the risk of hypotension.  Details Clinical studies have shown that green coffee extract decreases blood pressure (17971,17972). When used with antihypertensive drugs, green coffee might have additive blood pressure-lowering effects. However, this has not been shown in clinical research.

BETA-ADRENERGIC AGONISTS Interaction Rating = Moderate Be cautious with this combination. Severity = Mild •  Occurrence = Probable •  Level of Evidence = D Theoretically, concomitant use of large amounts of green coffee might increase cardiac inotropic effects of beta-agonists.  Details Green coffee can contain caffeine. Caffeine can increase cardiac inotropic effects of beta-agonists (15).

CIMETIDINE (Tagamet) Interaction Rating = Moderate Be cautious with this combination. Severity = Mild •  Occurrence = Likely •  Level of Evidence = B Theoretically, cimetidine might increase the effects and adverse effects of caffeine in green coffee.  Details Green coffee can contain caffeine. Cimetidine can reduce caffeine clearance by 31% to 42% (11736,24700).

CLOZAPINE (Clozaril) Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = B Theoretically, green coffee might increase the levels and adverse effects of clozapine and acutely exacerbate psychotic symptoms.  Details Green coffee can contain caffeine. Caffeine can increase the effects and toxicity of clozapine. Caffeine doses of 400-1000 mg daily inhibit clozapine metabolism (5051). Clozapine is metabolized by cytochrome P450 1A2 (CYP1A2). Researchers speculate that caffeine might inhibit CYP1A2. However, there is no reliable evidence that caffeine affects CYP1A2. There is also speculation that genetic factors might make some patients more sensitive to an interaction between clozapine and caffeine (13741).

CONTRACEPTIVE DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = Mild •  Occurrence = Probable •  Level of Evidence = B Theoretically, concomitant use might increase the effects and adverse effects of caffeine found in green coffee.  Details Green coffee can contain caffeine. Oral contraceptives decrease the rate of caffeine clearance by 40% to 65% (2714,11737).

DIPYRIDAMOLE (Persantine) Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Probable •  Level of Evidence = B Theoretically, green coffee might decrease the vasodilatory effects of dipyridamole and interfere with its use prior to stress testing.  Details Green coffee can contain caffeine. Caffeine is a methylxanthine that may inhibit dipyridamole-induced vasodilation (11770,11772,24974,37985,53795). It is recommended that methylxanthines such as caffeine, as well as methylxanthine-containing products such as green coffee, be stopped 24 hours prior to pharmacological stress tests (11770). Methylxanthines appear more likely to interfere with dipyridamole (Persantine) than adenosine-induced stress testing (11771).

DISULFIRAM (Antabuse) Interaction Rating = Moderate Be cautious with this combination. Severity = Mild •  Occurrence = Probable •  Level of Evidence = B Theoretically, disulfiram might increase the levels and adverse effects of caffeine.  Details Green coffee can contain caffeine. In human research, disulfiram decreases the clearance and increases the half-life of caffeine (11840).

DIURETIC DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, concomitant use might increase the risk of hypokalemia.  Details Green coffee can contain caffeine. Caffeine, especially in excessive amounts, can reduce potassium levels due to stimulation of the sodium-potassium pump (23579,37905,37953,38003,38034). Diuretics can also cause lower potassium levels.

EPHEDRINE Interaction Rating = Major Do not take this combination. Severity = High •  Occurrence = Probable •  Level of Evidence = D Theoretically, concomitant use might increase the risk of stimulant adverse effects.  Details Green coffee can contain caffeine. There is evidence that using ephedrine with caffeine might increase the risk of serious life-threatening or debilitating adverse effects such as hypertension, myocardial infarction, stroke, seizures, and death (1275,6486,9740,10307). Tell patients to avoid taking caffeine with ephedrine and other stimulants.

ESTROGENS Interaction Rating = Moderate Be cautious with this combination. Severity = Mild •  Occurrence = Probable •  Level of Evidence = B Theoretically, estrogens might increase the levels and adverse effects of caffeine.  Details Green coffee can contain caffeine. Estrogen inhibits caffeine metabolism (2714).

FLUCONAZOLE (Diflucan) Interaction Rating = Minor Be watchful with this combination. Severity = Mild •  Occurrence = Possible •  Level of Evidence = B Theoretically, fluconazole might increase the levels and adverse effects of caffeine.  Details Green coffee can contain caffeine. Fluconazole decreases caffeine clearance by approximately 25% (11022,24978).

FLUVOXAMINE (Luvox) Interaction Rating = Moderate Be cautious with this combination. Severity = Mild •  Occurrence = Probable •  Level of Evidence = B Theoretically, fluvoxamine might increase the levels and adverse effects of caffeine.  Details Green coffee can contain caffeine. Fluvoxamine reduces caffeine metabolism (6370,38287).

LITHIUM Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Probable •  Level of Evidence = D Theoretically, abrupt green coffee withdrawal might increase the levels and adverse effects of lithium.  Details Green coffee can contain caffeine. Abrupt caffeine withdrawal can increase serum lithium levels (609). Two cases of lithium tremor that worsened with abrupt coffee withdrawal have been reported (609,610).

MEXILETINE (Mexitil) Interaction Rating = Minor Be watchful with this combination. Severity = Mild •  Occurrence = Possible •  Level of Evidence = B Theoretically, mexiletine might increase the levels and adverse effects of caffeine.  Details Green coffee can contain caffeine. Mexiletine can decrease caffeine elimination by 50% (1260,11741,24981).

MONOAMINE OXIDASE INHIBITORS (MAOIs) Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = D Theoretically, concomitant use might increase the risk of a hypertensive crisis.  Details Green coffee can contain caffeine. Caffeine has been shown to inhibit monoamine oxidase (MAO) A and B in laboratory studies (37724,37877,37912,38108). Concomitant intake of large amounts of caffeine with MAOIs might precipitate a hypertensive crisis (15).

NICOTINE Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Probable •  Level of Evidence = B Theoretically, concomitant use might increase the risk of hypertension.  Details Green coffee can contain caffeine. Concomitant use of caffeine and nicotine has been shown to have additive cardiovascular effects, including increased heart rate and blood pressure. Blood pressure was increased by 10.8/12.4 mmHg when the agents were used concomitantly (36549).

PENTOBARBITAL (Nembutal) Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = B Theoretically, green coffee might reduce the effects of pentobarbital.  Details Green coffee can contain caffeine. Theoretically, caffeine might negate the hypnotic effects of pentobarbital (13742).

PHENOTHIAZINES Interaction Rating = Minor Be watchful with this combination. Severity = Mild •  Occurrence = Possible •  Level of Evidence = D Theoretically, phenothiazines might increase the levels and adverse effects of caffeine.  Details Green coffee can contain caffeine. Phenothiazines can reduce the metabolism of caffeine by inhibiting cytochrome P450 1A2 (CYP1A2) (23573,23574).

PHENYLPROPANOLAMINE Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Probable •  Level of Evidence = B Theoretically, phenylpropanolamine might increase the risk of hypertension, as well as the levels and adverse effects of caffeine.  Details Green coffee can contain caffeine. Concomitant use of phenylpropanolamine and caffeine might cause an additive increase in blood pressure (11738). Phenylpropanolamine also seems to increase caffeine serum levels (13743).

PIOGLITAZONE (Actos) Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, caffeine might increase the levels and clinical effects of pioglitazone.  Details Green coffee contains caffeine. Animal research suggests that caffeine can modestly increase the maximum concentration, area under the curve, and half-life of pioglitazone, and also reduce its clearance. This increased the antidiabetic effects of pioglitazone (108812). However, the exact mechanism of this interaction is unclear.

QUINOLONE ANTIBIOTICS Interaction Rating = Minor Be watchful with this combination. Severity = Mild •  Occurrence = Possible •  Level of Evidence = B Theoretically, quinolone antibiotics might increase the levels and adverse effects of caffeine.  Details Green coffee can contain caffeine. Concomitant use of quinolones can decrease caffeine clearance and increase effects and risk of adverse effects (606,607,608,23554,23555,23556,24695,24696,24697).

RILUZOLE (Rilutek) Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, concomitant use might increase the levels and adverse effects of both caffeine and riluzole.  Details Green coffee can contain caffeine. Caffeine and riluzole are both metabolized by cytochrome P450 1A2 (CYP1A2), and concomitant use might reduce metabolism of one or both agents (11739).

STIMULANT DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Probable •  Level of Evidence = C Theoretically, concomitant use might increase stimulant adverse effects.  Details Green coffee can contain caffeine. Due to the central nervous system (CNS) stimulant effects of caffeine, concomitant use with stimulant drugs can increase the risk of adverse effects (11832).

TERBINAFINE (Lamisil) Interaction Rating = Minor Be watchful with this combination. Severity = Mild •  Occurrence = Possible •  Level of Evidence = B Theoretically, terbinafine might increase the levels and adverse effects of caffeine.  Details Green coffee can contain caffeine. Terbinafine decreases the clearance of intravenous caffeine by 19% (11740).

THEOPHYLLINE Interaction Rating = Moderate Be cautious with this combination. Severity = Mild •  Occurrence = Probable •  Level of Evidence = B Theoretically, green coffee might increase the levels and adverse effects of theophylline.  Details Green coffee can contain caffeine. Large amounts of caffeine might inhibit theophylline metabolism (11741).

VERAPAMIL (Calan, others) Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, concomitant use might increase the levels and adverse effects of caffeine.  Details Green coffee can contain caffeine. Verapamil increases plasma caffeine concentrations by 25% (11741).

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General ...Orally, green coffee appears to be well-tolerated. Although green coffee contains caffeine, it is present in small quantities which are less likely to cause adverse effects. Green coffee contains about 20-50 mg caffeine per cup, compared with about 100 mg caffeine per cup of brewed coffee.

Cardiovascular ...Although acute administration of caffeine, a constituent of green coffee, can cause increased blood pressure, regular consumption does not seem to increase either blood pressure or pulse, even in mildly hypertensive patients (1451,1452,2722,13739). Drinking one or more cups daily of caffeinated coffee, such as green coffee, also doesn't seem to increase the risk of developing hypertension in habitual coffee drinkers (8033,13739).
Chlorogenic acids found in green coffee extracts may adversely affect plasma homocysteine levels. In one randomized controlled trial, 2 grams of chlorogenic acids (the amount found in about 1.5 L of strong coffee) daily for one week resulted in a 12% increase in plasma homocysteine levels (8035). However, in another trial of green coffee extract in a dose equivalent to 140 mg of chlorogenic acids daily for 4 months, there was a slight decrease in plasma homocysteine levels from baseline, but this did not differ significantly from placebo treatment (17970).
The diterpenes cafestol and kahweol found in green coffee beans have been implicated in the hypercholesterolemic effects of unfiltered coffee (19336,53599). However, these compounds are removed from some green coffee extracts. For instance, Svetol (Naturex, South Hackensack, NJ) is reported to contain less than 4 ppm of cafestol and kahweol (88171).

Dermatologic ...Positive skin tests and symptoms of contact allergy have been reported in workers exposed to green coffee bean dust (53568,53653).

Endocrine ...Some evidence shows that caffeine, a constituent of green coffee, is associated with fibrocystic breast disease, breast cancer, and endometriosis in females; however, this is controversial since findings are conflicting (8043). Restricting caffeine in females with fibrocystic breast conditions doesn't seem to affect breast nodularity, swelling, or pain (8996). A population analysis of the Women's Health Initiative observational study has found no association between consumption of caffeine-containing beverages and the incidence of invasive breast cancer in models adjusted for demographic, lifestyle, and reproductive factors (108806). Also, a dose-response analysis of 2 low-quality observational studies has found that high consumption of caffeine is not associated with an increased risk of breast cancer (108807).
Clinical research in healthy adults shows that increased consumption of caffeine results in increased insulin resistance (91023).

Gastrointestinal ...Orally, stomach irritation was reported by one person in a clinical trial of green coffee extract (104831).

Musculoskeletal ...Epidemiological evidence regarding the relationship between caffeine, which is found in green coffee, and the risk of osteoporosis is contradictory. Caffeine can increase urinary excretion of calcium (2669,10202,11317). Females identified with a genetic variant of the vitamin D receptor appear to be at an increased risk of the detrimental effect of caffeine on bone mass (2669). However, moderate caffeine intake, less than 300 mg per day, does not seem to significantly increase osteoporosis risk in most postmenopausal adults with normal calcium intake (2669,6025,10202,11317).

Neurologic/CNS ...Orally, dizziness was reported by one person in a clinical trial of green coffee extract (104831).

Ocular/Otic ...Conjunctivitis caused by green coffee bean dust in coffee workers has been described in case reports (53657,53589).

Psychiatric ...Chronic use of caffeine, especially in large amounts, may produce tolerance, habituation, and psychological dependence (3719). Abrupt discontinuation of caffeine may result in physical withdrawal symptoms, including headache, fatigue, drowsiness, decreased physical energy, difficulty concentrating, depression, anxiety, irritability, and reduced alertness (13738). Certain populations such as children and the elderly may be more susceptible to the adverse effects of caffeine (13736).

Pulmonary/Respiratory ...Occupational exposure to green coffee beans has been documented to cause numerous adverse respiratory reactions, including bronchial reactivity, asthma, and rhinitis (53589,53641,53644,53648,53650,53665). Healthy subjects exposed experimentally to green coffee dust displayed acute decreases in expiratory flow rates (53653). In one study, green coffee workers displayed numerous acute respiratory symptoms when exposed to dust; these included coughing, increased sputum, sneezing, difficulty in breathing, running nose, and wheezing; these symptoms resolved after leaving work (53647).

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