Beta-Sitosterol
Other ·Exploratory record · not publication-reviewed ·Updated July 13, 2026
Beta-sitosterol is a plant sterol found in vegetable oils, nuts, seeds, legumes, and BPH phytotherapy extracts. Cochrane-reviewed trials suggest beta-sitosterol preparations can improve urinary symptoms and flow measures in benign prostatic hyperplasia, but they do not clearly reduce prostate size or prove long-term prevention of urinary retention. Plant sterols can also lower LDL cholesterol by reducing intestinal cholesterol absorption, though BPH supplement doses and lipid-lowering food doses may differ.
Exploratory record, not a reviewed medical publication.
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This generated database record has not completed a claim-level review by a qualified human medical reviewer. Bibliography links and evidence labels are not approval. The page remains available for reference and is excluded from search indexing.
What the research says.
A quick, data-only summary. The full evidence, dosing, and sources are below.
Beta-Sitosterol is an other most often used for may improve bph urinary symptom scores, may improve peak urinary flow, may reduce postvoid residual volume. NutriStack rates the overall evidence as moderate. A typical adult dose is 60-130 mg/day beta-sitosterol for BPH products; 1.5-2 g/day plant sterols for LDL-C lowering in foods or supplements, commonly taken as standardized beta-sitosterol or mixed plant sterol product with clear dose labeling. This profile indexes 3 sources.
- Nausea
- Indigestion
- Constipation or diarrhea
- Sitosterolemia or suspected inherited plant sterol storage disease3
- Pregnancy and breastfeeding unless food-level intake only
The bottom line
Evidence rating moderate. Most-documented uses: may improve bph urinary symptom scores, may improve peak urinary flow, may reduce postvoid residual volume. 3 sources indexed (1995–2014), with 0 interaction records on file.
How it works, mechanistically.
Core mechanism
In the intestine, plant sterols compete with cholesterol for micellar incorporation and reduce cholesterol absorption, which can lower LDL-C when intake is sufficient. In BPH, beta-sitosterol-containing extracts may influence inflammatory signaling, membrane sterol composition, and prostate smooth muscle or stromal pathways, but the exact active constituents are not fully resolved. Rare sitosterolemia makes plant sterol supplementation unsafe because sterols accumulate excessively.3
Dosing & protocol.
Take with meals that contain fat for cholesterol-lowering use. Systemic absorption is normally low, but absorption is excessive in sitosterolemia.3
What it actually costs.
Real-world pricing across three quality tiers. Assumes Beta-sitosterol capsule.
BPH-dose capsules are cheaper than gram-dose plant sterol foods used for LDL-C lowering. Updated 2026-06-04.
Full safety detail.
Side effects
- Nausea
- Indigestion
- Constipation or diarrhea
- Reduced absorption of carotenoids with high plant sterol intake
- Rare sexual side effects reported in BPH products
Sources, by evidence tier.
Numbered references. Citations throughout the page link here.
Meta-analyses & systematic reviews
1- 1Beta-sitosterols for benign prostatic hyperplasiaWilt TJ et al. · Cochrane Database of Systematic Reviews · 1999
Four randomized trials suggested improvements in urinary symptoms, peak flow, and residual volume.
Randomized controlled trials
1- 2Randomised, placebo-controlled, double-blind clinical trial of beta-sitosterol in patients with benign prostatic hyperplasiaBerges RR et al. · Lancet · 1995
Beta-sitosterol improved symptom and urinary flow parameters in men with BPH.
Reviews & position papers
1- 3Plant sterols and plant stanols in the management of dyslipidaemia and prevention of cardiovascular diseaseGylling H et al. · Atherosclerosis · 2014
Regular plant sterol or stanol intake lowers LDL-C when used in effective doses.
Common questions.
Quick answers about Beta-Sitosterol, drawn from the data on this page.
What is Beta-Sitosterol?
Beta-sitosterol is a plant sterol found in vegetable oils, nuts, seeds, legumes, and BPH phytotherapy extracts. Cochrane-reviewed trials suggest beta-sitosterol preparations can improve urinary symptoms and flow measures in benign prostatic hyperplasia, but they do not clearly reduce prostate size or prove long-term prevention of urinary retention. Plant sterols can also lower LDL cholesterol by reducing intestinal cholesterol absorption, though BPH supplement doses and lipid-lowering food doses may differ.
What is Beta-Sitosterol used for?
Commonly cited benefits of Beta-Sitosterol include: May improve BPH urinary symptom scores; May improve peak urinary flow; May reduce postvoid residual volume; May lower LDL cholesterol when used as plant sterol therapy. NutriStack rates the overall evidence as moderate.
What is a typical dose of Beta-Sitosterol?
A typical adult dose of Beta-Sitosterol is 60-130 mg/day beta-sitosterol for BPH products; 1.5-2 g/day plant sterols for LDL-C lowering in foods or supplements. The commonly recommended form is Standardized beta-sitosterol or mixed plant sterol product with clear dose labeling. These are general ranges, not personalized advice; confirm the right dose with a clinician.
What are the side effects of Beta-Sitosterol?
Reported side effects include nausea, indigestion, constipation or diarrhea, reduced absorption of carotenoids with high plant sterol intake, rare sexual side effects reported in bph products. This is educational information; check with a healthcare professional before use.
How strong is the evidence for Beta-Sitosterol?
NutriStack rates this as Moderate, meaning several aligned RCTs or one large RCT plus supporting reviews. Full tier criteria are at https://nutristackapp.com/methodology/evidence-tiers.
Use this with your stack
Beta-Sitosterol in NutriStack.
Add it to your stack, see how it interacts with everything else you take, and get a Stack Score that updates the moment it does.