Gamma Oryzanol
ferulic acid esters of plant sterols (rice bran oil)
TL;DR
Gamma oryzanol is a ferulic-acid-ester fraction of rice bran oil. The most credible signal is modest LDL cholesterol lowering, plus older Japanese work on menopausal symptoms. The bodybuilding claim that it raises testosterone or growth hormone has been tested and failed.
Ideal For
- People with mildly elevated LDL who want a food-adjacent option
- Those looking for a well-tolerated adjunct to diet change
Avoid If
- You have sitosterolemia
- You are pregnant or breastfeeding
- You are buying it for testosterone or growth hormone — trials show no effect
Frequently Asked Questions
Overview
Gamma oryzanol is not a single compound but a mixture of ferulic acid esterified to plant sterols and triterpene alcohols, isolated from rice bran oil. It has been used in Japan since the 1960s for autonomic and menopausal complaints, and it appears in lipid research because sterol esters reduce cholesterol absorption. Trials feeding rice bran oil or purified oryzanol generally show total and LDL cholesterol falling by a modest amount, consistent with a plant-sterol mechanism rather than anything exotic. The 1990s sports-supplement claim — that oryzanol boosts testosterone and growth hormone — was tested in resistance-trained men and produced no anabolic advantage over placebo. Treat it as a cardiometabolic ingredient with a good safety record and small effect sizes.
How It Works
- Plant-sterol esters compete with cholesterol for micellar absorption in the gut
- Ferulic acid moiety provides antioxidant and anti-inflammatory activity
- Older work suggests modulation of hypothalamic autonomic and LH signalling (menopausal symptom rationale)
- No measurable anabolic hormone effect in controlled human exercise trials
Health Concerns Addressed
No linked health concerns yet.
Supporting Research4 studies
Similar cholesterol-lowering properties of rice bran oil, with varied gamma-oryzanol, in mildly hypercholesterolemic men
Berger A, Rein D, Schafer A +4 more
Rice bran oils with low and high gamma-oryzanol content lowered cholesterol equally, indicating the effect is not due to gamma-oryzanol.
The Effects of Gamma-Oryzanol Supplementation During Resistance Exercise Training
Fry AC, Bonner E, Lewis DL +3 more
No differences were observed between gamma-oryzanol and placebo for strength, body composition or circulating anabolic hormones.
Rice Bran Oil Containing Gamma-Oryzanol Improves Lipid Profiles and Antioxidant Status in Hyperlipidemic Subjects: A Randomized Double-Blind Controlled Trial
Sawadikiat P, Bumrungpert A, Chongsuwat R +1 more
Rice bran oil high in gamma-oryzanol reduced total and LDL cholesterol and improved antioxidant status in hyperlipidemic subjects.
Effects of gamma oryzanol supplementation on anthropometric measurements and muscular strength in healthy males following chronic resistance training
Eslami S, Esa NM, Marandi SM +2 more
Gamma-oryzanol supplementation increased muscular strength measures during chronic resistance training without changing body composition.
Safety Information
Potential Side Effects
Well tolerated. Occasional mild GI upset, dry mouth or drowsiness reported in older trials.
Contraindications
Avoid in pregnancy and lactation for lack of data. People with sitosterolemia should avoid plant sterol esters.
Drug Interactions
- Statins (additive LDL lowering — monitor rather than avoid)
- Ezetimibe (overlapping absorption mechanism)
Pregnancy & Breastfeeding
Pregnancy: insufficient_data
Breastfeeding: insufficient_data
Dosage Guidelines
Dosage Used in Studies
Consult healthcare provider
Best Time to Take
With meals containing fat
Best Form
Purified gamma oryzanol 300 mg, or cooking with rice bran oil for a food-first approach
Bioavailability
Low absolute absorption; the cholesterol effect is largely intraluminal, so this does not limit it
Dosing by Goal
| Goal | Dose | Notes |
|---|---|---|
| 300 mg/day | Typical lipid-trial dose; give it 8-12 weeks | |
| 300 mg/day | Based on older Japanese observational and open-label work |
Forms Compared
Standardised, easiest to dose
Food-level intake; also supplies vitamin E tocotrienols
Food & Timing
Take with food — absorption of sterol esters depends on dietary fat
Medical Disclaimer
The information provided on this website is for educational and informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or before starting any supplement regimen.
Individual results may vary. The statements on this website have not been evaluated by the Food and Drug Administration. Products and information are not intended to diagnose, treat, cure, or prevent any disease.