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Beta-Sitosterol
Plant sterol that reduces BPH urinary symptoms in clinical trials and blocks intestinal cholesterol absorption.
What the evidence says
Beta-Sitosterol appears to help in 3 of 4 studies with measurable effects — the evidence leans clearly favourable.
Most evidence is from high-quality meta-analyses and randomised trials published 1995–2026 with a typical study size of 351 participants.
Based on 26 studies · 8 meta-analyses · 11 RCTs · 35,149 total participants
Confidence
HighWhat the studies found
By outcome
See full supplement plans that include Beta-Sitosterol.
Beta-Sitosterol has an evidence score of 8.5/10 — very strong evidence based on 26 indexed studies, including 11 meta-analyses. Plant sterol that reduces BPH urinary symptoms in clinical trials and blocks intestinal cholesterol absorption.
The commonly studied dose of Beta-Sitosterol is 60-130mg daily for prostate; 2-3g for cholesterol. Research points to an estimated optimal dose around 2000mg, with a minimum effective dose near 1500mg. Individual response varies — start low and adjust.
The best time to take Beta-Sitosterol is with meals. Take it with food. Beta-sitosterol works by competing with dietary cholesterol for absorption in the intestinal lumen via NPC1L1 transporters.
Resveratrol
Likely helpsPolyphenol found in red wine and grapes, studied for its potential anti-aging and cardiovascular benefits through sirtuin activation.
Soy Isoflavones
Likely helpsPlant compounds with weak estrogenic effects that support menopausal symptoms, bone health, and cardiovascular function.
Last reviewed May 2026 · evidence from 39 studies · how we score
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
Beta-Sitosterol is one of the most common plant sterols found in foods like nuts, seeds, and vegetables. It's particularly well-studied for prostate health, with multiple clinical trials showing benefits for BPH symptoms. It also helps lower cholesterol absorption in the gut, making it useful for cardiovascular health.
May reduce DHT in prostate tissue
Blocks cholesterol absorption in the gut
How Beta-Sitosterol works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
60-130mg daily for prostate; 2-3g for cholesterol
Loading: Not required
Take with food
| Form | Type |
|---|---|
| 💊Standardized phytosterol complex | Recommended |
| 💊Beta-sitosterol isolate | Alternative |
| 💊Plant sterol-enriched foods | Alternative |
Often sold as mixed phytosterols. Check label for actual beta-sitosterol content.
Minimum: 4 weeks
Optimal: 12 weeks
Cycling: Not required
Note: For cholesterol benefits, take with meals to compete with dietary cholesterol absorption.
Based on meta-analysis of 124 RCTs showing 6-12% LDL reduction at standard doses. Conservative effectiveness scale with optimal intake around 2g/day. No significant effects on HDL or triglycerides observed.
Better urinary flow and reduced symptoms
Modest lowering of LDL cholesterol
Well-supported use; get proper diagnosis first
Similar mechanisms; may be redundant
Tip: Take with food
Often combined for prostate support
Enhanced prostate health support
PSO naturally contains beta-sitosterol; supplementing additional beta-sitosterol may amplify phytosterol-mediated prostate and cholesterol benefits
Stronger phytosterol effect on BPH symptoms and lipid profile
Beta-Sitosterol is generally well-tolerated and considered safe for most healthy adults at recommended doses. The most commonly reported side effects are GI discomfort. Use caution if any of these apply to you: Sitosterolemia (rare genetic condition).
Quercetin
Likely helpsFlavonoid with senolytic and anti-inflammatory properties — supports immune defense, allergy relief, and exercise performance.
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