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Oral Intake of Rice Bran Oil Enriched With γ-Oryzanol and Phytosterol Esters Improves Skin Conditions: A
Masatoshi Jinnin1, Rie Ishihara2, Asao Hosoda2
1Department of Dermatology, Wakayama Medical University, Wakayama, Japan.
The Journal of Dermatology
|May 15, 2026
Summary
Oral intake of rice bran oil, rich in polyphenols and phytosterols, significantly improved skin hydration and elasticity. This study highlights its potential for enhancing skin health and appearance.
Area of Science:
- Dermatology
- Nutritional Science
- Cosmetic Science
Background:
- Rice bran oil contains beneficial compounds like gamma-oryzanol (polyphenols) and phytosterols.
- These compounds show potential for improving skin health, including elasticity and hydration.
Purpose of the Study:
- To evaluate the effects of oral supplementation with rice bran oil polyphenols and phytosterols on skin conditions.
- To assess changes in skin hydration, elasticity, and other parameters over a 12-week period.
Main Methods:
- A 12-week double-blind randomized clinical trial involving 70 healthy Japanese participants (aged 20-59).
- Participants received either a test product containing rice bran oil or a placebo.
- Key assessments included stratum corneum water content, transepidermal water loss, skin elasticity, sebum levels, and UV spot scores.
Main Results:
- Significant increases in stratum corneum water content were observed in the test group at weeks 4, 8, and 12 compared to baseline.
- The test group showed significantly higher mean changes in water content at weeks 8 and 12 compared to the placebo group.
- Improvements in UV spot scores and reduced redness were noted earlier in the test group, alongside increased skin satisfaction.
Conclusions:
- Daily oral intake of rice bran oil effectively improves skin moisture levels.
- The synergistic action of polyphenols and phytosterols in rice bran oil contributes to enhanced skin hydration and potentially other benefits.
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