Safety Profile
Overall safety rating: Generally Safe
Beta-Sitosterol Side Effects & Safety
This content is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before starting any supplement. Full disclaimer
Potential Side Effects
- Mild GI discomfort (nausea, bloating, diarrhea) at higher doses
- May reduce absorption of fat-soluble vitamins (A, D, E, K) at very high doses
- Rare: erectile dysfunction reported in isolated cases at high doses
- Contraindicated in sitosterolemia (rare genetic condition)
Drug & Supplement Interactions
- May reduce absorption of ezetimibe and other cholesterol-lowering drugs
- Separate from fat-soluble vitamins by 2 hours at high doses
- Potential additive effect with statin medications on cholesterol
- May reduce absorption of carotenoids (beta-carotene, lycopene)
Maximum Dose
Do not exceed: 2g daily (plant sterol blend); no established UL for isolated beta-sitosterol
References
- Berges RR, Windeler J, Trampisch HJ, Senge T (1995). Randomised, placebo-controlled, double-blind clinical trial of beta-sitosterol in patients with benign prostatic hyperplasia. The Lancet. DOI PubMed
- Wilt TJ, MacDonald R, Ishani A (1999). Beta-sitosterol for the treatment of benign prostatic hyperplasia: a systematic review. BJU International. DOI PubMed
- Klippel KF, Hiltl DM, Schipp B (1997). A multicentric, placebo-controlled, double-blind clinical trial of beta-sitosterol for benign prostatic hyperplasia. British Journal of Urology. DOI PubMed
- Abumweis SS, Barake R, Jones PJH (2008). Plant sterols/stanols as cholesterol lowering agents: a meta-analysis of randomized controlled trials. Food & Nutrition Research. DOI PubMed