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LIKELY EFFECTIVE

• Benign prostatic hyperplasia (BPH). Oral beta-sitosterol is beneficial for most symptoms of BPH. Details: Taking beta-sitosterol 60-130 mg orally in 2-3 divided doses daily for up to 18 months significantly improves urinary symptoms, increases maximum urinary flow, and decreases postvoid residual urine volume; however, it does not affect prostate size (5327,5328,5329,7195,7198,34975). Additionally, one study suggests that taking an enriched form of saw palmetto oil (Vispo) 200 mg containing 3% beta-sitosterol twice daily for 12 weeks seems to be more effective than standard saw palmetto oil containing 0.3% beta-sitosterol for reducing some measures of overall symptoms of BPH (104803). Although some preliminary research shows no benefit of beta-sitosterol on symptoms of BPH, the variability in doses used, the short duration of treatment, the small study sizes, and the differing severity of disease at baseline limit the reliability of these latter results (35124,96784).
• Hypercholesterolemia. Oral beta-sitosterol is beneficial for hypercholesterolemia. Details: Taking beta-sitosterol orally significantly reduces total and low-density lipoprotein (LDL) cholesterol levels, but has little or no effect on high-density lipoprotein (HDL) cholesterol levels. Beta-sitosterol 0.65-1.5 grams twice daily has been used, typically in conjunction with a low-fat diet (6668,7195,112081). The effects of combination formulations containing beta-sitosterol have also been evaluated in patients with hypercholesterolemia. Some preliminary clinical research in these patients shows that taking a combination of soy protein 8 grams plus beta-sitosterol 2 grams daily for 40 days lowers LDL cholesterol by 17-20 mg/dL, but does not improve triglyceride or HDL cholesterol levels, when compared to baseline (35013,35039). Other clinical research shows that taking a combination of beta-sitosterol 2.5 grams daily along with cholestyramine (Questran, Bristol Myer Squibb) 8 grams daily for 12 weeks reduces total cholesterol by about 23 mg/dL and LDL cholesterol by 15 mg/dL when compared to baseline, but is less effective than atorvastatin 10 or 80 mg daily (35100).

POSSIBLY EFFECTIVE

• Coronary heart disease (CHD). The US Food and Drug Administration (FDA) has approved an authorized health claim for dietary plant sterols, when taken in doses of at least 3.4 grams daily as part of a diet low in saturated fat and cholesterol, for reducing the risk of CHD. Details: In 2010, the FDA authorized a health claim stating that consuming at least 3.4 grams of plant sterols daily, as part of a diet low in saturated fat and cholesterol, may reduce the risk of heart disease (102365). This health claim is based on evidence showing that plant sterols can lower cholesterol levels. However, there is currently no evidence directly linking dietary intake of plant sterols with a reduced risk for developing CHD.
• Familial hypercholesterolemia. Oral beta-sitosterol, in combination with a cholesterol-lowering diet, seems to reduce low-density lipoprotein (LDL) cholesterol levels in patients with familial hypercholesterolemia. However, it doesn't seem to work as well as sitostanol or bezafibrate. Details: Preliminary clinical research shows that taking beta-sitosterol for 1-4 months while following a cholesterol-lowering diet reduces total cholesterol by 6% to 13% and LDL cholesterol by 6% to 20% in adult and pediatric patients with familial hypercholesterolemia. Beta-sitosterol 2.5-21.1 grams taken in up to three divided doses daily for 1-3 months has been used in adults. Beta-sitosterol 2-4 grams three times daily for 3 months has been used in children and adolescents (3889,5331,5332,5333,35067). Some research suggests that the optimal dose of beta-sitosterol is 6 grams daily; higher doses do not appear to be more effective (5333). However, some research in pediatric patients shows that beta-sitosterol can also decrease levels of high-density lipoprotein (HDL) cholesterol (5332) and that beta-sitosterol appears to be less effective for reducing LDL cholesterol when compared to sitostanol (3889). Furthermore, beta-sitosterol does not appear to improve triglyceride levels (5333). Some research has compared beta-sitosterol to cholesterol-lowering medication. In children with familial hypercholesterolemia, taking beta-sitosterol 1 grams three times daily in combination with the fibrate drug bezafibrate 200 mg once daily for 24 months reduces cholesterol as effectively as taking bezafibrate 200 mg twice daily. However, taking beta-sitosterol 2 grams three times daily is less effective for lowering LDL cholesterol when compared with bezafibrate 200 mg twice daily (5334).

INSUFFICIENT RELIABLE EVIDENCE to RATE

• Allergic rhinitis (hay fever). Although there is interest in using oral beta-sitosterol for allergic rhinitis, there is insufficient reliable information about the clinical effects of beta-sitosterol for this condition.
• Androgenic alopecia. Oral beta-sitosterol has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: A small clinical study in males with androgenic alopecia shows that a combination of beta-sitosterol 50 mg plus saw palmetto extract 200 mg taken twice daily for an average of 4.6 months improves subjective scores of hair quantity and quality when compared with baseline (15550). The validity of this finding is limited by the lack of a comparator group.
• Asthma. Although there is interest in using oral beta-sitosterol for asthma, there is insufficient reliable information about the clinical effects of beta-sitosterol for this condition.
• Burns. Topical beta-sitosterol has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: Preliminary clinical research shows that applying an ointment containing sesame oil, beta-sitosterol, berberine, and other plant ingredients (MEBO) is as effective as applying silver sulfadiazine dressing twice daily for healing burns and preventing bacterial infection (13526). Furthermore, this ointment appears to be more effective than povidone-iodine plus bepanthenol cream for reducing pain. The ointment can also shorten the hospital stay of these patients by almost one day when compared with povidone-iodine plus bepanthenol (35118). However, when used for second-degree facial burns, this ointment increases healing time by about 2 days and worsens pain and discomfort when compared with a specific dressing containing ionic silver (Aquacel Ag Hydrofiber) (35117). The ointment has been applied to partial-thickness burns as a thick layer every 4-12 hours for up to 18 days or until release from the hospital in patients aged 2 years and older (13526,35117,35118).
• Cancer. It is unclear if dietary beta-sitosterol is beneficial for cancer prevention. Details: A meta-analysis of population research has found that although the highest intake of plant sterols is associated with a reduced risk of having cancer when compared with the lowest intake, there is no association between beta-sitosterol itself and cancer risk (106084). Also, population research suggests that dietary intake of beta-sitosterol does not affect the risk of colon cancer (34993).
• Chronic prostatitis and chronic pelvic pain syndrome (CP/CPPS). Although there is interest in using oral beta-sitosterol for prostatitis, there is insufficient reliable information about the clinical effects of beta-sitosterol for this condition.
• Esophageal cancer. It is unclear if dietary beta-sitosterol intake influences the outcome of esophageal cancer. Details: In Chinese people with esophageal squamous cell carcinoma, the mortality rate does not seem to differ between those with the lowest versus the highest intake of dietary beta-sitosterol, measured five years before diagnosis (112082).
• HIV/AIDS. Although there is interest in using oral beta-sitosterol for HIV/AIDS, there is insufficient reliable information about the clinical effects of beta-sitosterol for this condition.
• Menopausal symptoms. Although there is interest in using oral beta-sitosterol for menopausal symptoms, there is insufficient reliable information about the clinical effects of beta-sitosterol for this purpose.
• Migraine headache. Although there is interest in using oral beta-sitosterol for migraine headache, there is insufficient reliable information about the clinical effects of beta-sitosterol for this condition.
• Obesity. It is unclear if oral beta-sitosterol is beneficial for obesity. Details: In Chinese adults, higher dietary intake of beta-sitosterol is inversely related to the risk of being overweight. The risk of central obesity specifically is linked to beta-sitosterol intake in males (112083).
• Psoriasis. Although there is interest in using oral beta-sitosterol for psoriasis, there is insufficient reliable information about the clinical effects of beta-sitosterol for this condition.
• Rheumatoid arthritis (RA). It is unclear if oral beta-sitosterol is beneficial for RA. Details: Preliminary clinical research shows that taking a specific supplement (Moducare) containing beta-sitosterol 20 mg and beta-sitosterol glucoside 0.2 mg three times daily for 24 weeks improves pain and symptoms in 28% to 85% of patients with RA when compared with baseline (35200). The validity of this finding is limited by the lack of a comparator group.
• Systemic lupus erythematosus (SLE). Although there is interest in using oral beta-sitosterol for SLE, there is insufficient reliable information about the clinical effects of beta-sitosterol for this condition.
• Thrombocytopenia. Although there is interest in using oral beta-sitosterol for thrombocytopenia, there is insufficient reliable information about the clinical effects of beta-sitosterol for this condition.
• Tuberculosis. It is unclear if oral beta-sitosterol is beneficial for tuberculosis. Details: A small clinical trial shows that taking beta-sitosterol orally as an adjunct to conventional treatment for tuberculosis can increase lymphocyte counts when compared with placebo; however, beta-sitosterol does not seem to decrease the time to cure based on negative sputum culture (5337).
• Upper respiratory tract infection (URTI). Although there is interest in using oral beta-sitosterol for upper respiratory infections such as bronchitis, common cold, exercise-induced respiratory infections, and influenza, there is insufficient reliable information about the clinical effects of beta-sitosterol for these conditions.
• Wound healing. Although there is interest in using topical beta-sitosterol for wound healing, there is insufficient reliable information about the clinical effects of beta-sitosterol for this purpose. More evidence is needed to rate beta-sitosterol for these uses.

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LIKELY SAFE ...when used orally and appropriately. Beta-sitosterol has been safely used at a dose of 130 mg daily for up to 18 months or a dose of up to 21.1 grams daily for up to 3 months (5327,5328,5329,5330,5331,5332,5333,5334,5336,5337) (7198,10638). There is insufficient reliable information available about the safety of beta-sitosterol when used topically.

CHILDREN: LIKELY SAFE
when used orally and appropriately. Beta-sitosterol has been safely used at a dose of 2-4 grams three times daily for up to 3 months (3889,5331,5332,5333,5334,35067).

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

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General ...Orally, beta-sitosterol is generally well tolerated. Topically, beta-sitosterol seems to be well tolerated.
Most Common Adverse Effects:
Orally: Constipation, diarrhea, gas, indigestion, and nausea.

Dermatologic ...Orally, beta-sitosterol can worsen acne when taken alone or in combination with saw palmetto (5331,15550).

Gastrointestinal ...Orally, beta-sitosterol can cause nausea, indigestion, gas, diarrhea, or constipation (5327,5328). Beta-sitosterol can also reduce the appetite (5334). There is a case report of acute pancreatitis thought to be associated with taking beta-sitosterol in a 57-year-old male. Symptoms started the first day of use, but did not return when he stopped taking beta-sitosterol (106080).
Single reports of reduced appetite, flatulence, and diarrhea have been reported for patients taking a combination of saw palmetto and beta-sitosterol (15550).

Genitourinary ...Orally, beta-sitosterol can cause erectile dysfunction and loss of libido (5327,5329).

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