Oryzanol (Gamma-Oryzanol)

Also known as: gamma-oryzanol, γ-oryzanol, rice bran oil extract, ferulic acid esters

Evidence under review. — Not yet rated

Rice bran compound with antioxidant properties; limited clinical evidence for most marketed benefits.

What it does

Gamma-oryzanol is a mixture of ferulic acid esters found naturally in rice bran oil. It has antioxidant properties and has been studied for potential effects on cholesterol levels, menopausal...
Evidence quality

Evidence base hasn't been formally rated yet. See research below.
Clinical dose

No established dose from provided studies

What the Science Says

Gamma-oryzanol is a mixture of ferulic acid esters found naturally in rice bran oil. It has antioxidant properties and has been studied for potential effects on cholesterol levels, menopausal symptoms, and exercise performance, though clinical evidence is limited. Most research is preliminary or based on animal studies, and no strong human trial data was available for this review.

What It Doesn't Do

Not proven to build muscle or boost testosterone in humans. No solid evidence it burns fat. Claims about athletic performance enhancement are not backed by strong clinical trials. Not a proven treatment for menopause symptoms despite traditional use in Japan.

Evidence-Based Benefits

May modestly reduce LDL cholesterol when consumed as part of rice bran oil.

Weak Evidence

Effective at: No established dose from provided studies

Acts as a dietary antioxidant by neutralizing free radicals in cell-based studies.

Weak Evidence

Effective at: No established dose from provided studies

Absorption & Bioavailability

Poor to Moderate — oryzanol is poorly absorbed from the gut; some ferulic acid metabolites are detectable in blood, but overall bioavailability is considered low based on general pharmacokinetic knowledge.

Red Flags to Watch For

Most marketed benefits (muscle building, fat loss, hormone support) are not supported by strong human clinical trials
Often sold at doses with no established clinical basis — effective human dose is unknown
Frequently combined with other ingredients, making it impossible to isolate oryzanol's effects
Limited published research available despite being in 135+ registered supplement products

Frequently Asked Questions

What does Oryzanol (Gamma-Oryzanol) do?

Rice bran compound with antioxidant properties; limited clinical evidence for most marketed benefits.

What is the effective dose of Oryzanol (Gamma-Oryzanol)?

No established dose from provided studies

Is Oryzanol (Gamma-Oryzanol) safe?

Most marketed benefits (muscle building, fat loss, hormone support) are not supported by strong human clinical trials

What doesn't Oryzanol (Gamma-Oryzanol) do?

Not proven to build muscle or boost testosterone in humans.

Research Sources

General knowledge — no paper abstracts were provided for this analysis. Limited published research available.

This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-05-25