Beta-Sitosterol (Plant Sterol · Phytosterol · Cholesterol Competitor)
Compiled from published pharmacological and botanical literature. Not independently verified by Herbuno. Spotted an error or have a correction? Flag it below →
| CAS No. | 83-46-5 |
| Class | Lipid · Phytosterol · 4-Desmethyl Sterol |
| Source | Triticum aestivum (Wheat germ), Glycine max (Soybean), Elaeis guineensis (Palm) — seed oils; ubiquitous in plant cell membranes |
| Claim strength | High |
| Buy from Herbuno | Beta-Sitosterol Extract Powder → |
Beta-sitosterol was first isolated in the early 20th century and phytosterol-enriched foods were commercially introduced in Scandinavia in the 1990s following clinical evidence for cholesterol reduction. The FDA authorised a qualified health claim for plant sterol esters and reduced risk of coronary heart disease in 2000. In traditional herbal medicine, saw palmetto, pygeum, and stinging nettle — all rich in beta-sitosterol — were used for urinary and prostate complaints across European and Native American traditions centuries before the sterol was identified as the active constituent. Beta-sitosterol is the most abundant plant sterol in the human diet, competing with cholesterol for intestinal absorption via shared micellar solubilisation and enterocyte transporter proteins.
Beta-Sitosterol for Cholesterol Reduction, Prostate Health & Immune Support — Evidence
LDL cholesterol reduction — FDA-qualified health claim: Meta-analyses of 80+ RCTs confirm that plant sterols at 1.5–3g per day reduce LDL cholesterol by 8–15% through competitive inhibition of intestinal cholesterol absorption. The mechanism is entirely GI-mediated. Claim strength: High.
Prostate health — BPH symptom support: Multiple RCTs with isolated beta-sitosterol at 60–130mg per day document significant improvements in International Prostate Symptom Score (IPSS) and urinary flow rate versus placebo. A Cochrane review confirmed consistent benefits. Claim strength: High.
Immune modulation: Beta-sitosterol has documented immunomodulatory properties — enhancing T-lymphocyte proliferation and NK cell activity in preclinical and preliminary human studies. Claim strength: Moderate.
Beta-Sitosterol Dosage, Standardisation & Formulator Specification
Clinically referenced dose: 1.5–3g per day of total plant sterols for cholesterol reduction. 60–130mg per day of isolated beta-sitosterol for prostate health applications. Confirm individual sterol fractions by gas chromatography (GC) on the CoA.
Pairs with: Oat beta-glucan (complementary LDL reduction mechanisms), psyllium husk (cardiovascular fiber stack), saw palmetto extract (prostate health combination), zinc (men's health formulations).
Frequently Asked Questions — Beta-Sitosterol
How does beta-sitosterol lower cholesterol?
Beta-sitosterol competes with cholesterol for incorporation into bile acid micelles in the small intestine, reducing absorption. The liver responds by upregulating LDL receptor expression. The mechanism is entirely GI-mediated.
What is the evidence for beta-sitosterol in prostate health?
Multiple RCTs at 60–130mg per day document significant improvements in IPSS symptom scores and peak urinary flow in BPH. A Cochrane review confirmed consistent benefits.
What beta-sitosterol percentage should I specify?
For prostate health in capsules: 40–90% extract. For cholesterol management: 90%+ purity. Always confirm individual sterol fractions by GC on the CoA.
Can beta-sitosterol replace statin therapy?
No. At 1.5–3g per day it achieves 8–15% LDL reduction — meaningful for mild hypercholesterolaemia but not a statin replacement.
Claim-strength scale – High = multiple human studies; Moderate = a few trials; Emerging = early lab data.
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