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rice bran

What does the research say about rice bran?

5 health outcomes synthesised

Rice bran is a nutrient-dense byproduct of rice milling that has been researched for cardiovascular health benefits, with evidence spanning 5 health outcomes. The strongest evidence supports its role in reducing blood cholesterol, with 6 of 7 studies reporting beneficial effects at doses around 30 g/day, primarily in clinical populations such as those with metabolic syndrome or coronary artery disease. Most studies have used rice bran oil rather than whole rice bran, so effects may depend on the form consumed.

Strongest evidence: Rice bran shows high-strength evidence for reducing blood cholesterol (6 of 7 studies beneficial, moderate effect size) and reducing LDL cholesterol (5 of 5 studies beneficial, moderate effect size). For both outcomes, effects are typically observed at doses ≥30 g/day (most studies used rice bran oil) over approximately 8 weeks. Evidence is also moderate for reducing triglyceride levels, where 3 of 5 studies showed benefit, including a 2024 meta-analysis (n=572) reporting a reduction of -15.13 mg/dL.

Frequently asked

  • What is rice bran good for according to research?
    Research indicates rice bran may help reduce blood cholesterol, LDL cholesterol, and triglyceride levels. The strongest evidence supports a moderate effect on total cholesterol (6 of 7 studies beneficial) and LDL cholesterol (5 of 5 studies beneficial), typically at doses of 30 g/day. Evidence for raising HDL cholesterol is weaker and mixed.
  • What dose of rice bran is typically used in studies?
    The most common effective dose across studies is approximately 30 g/day, usually in the form of rice bran oil. Studies typically last 6 to 8 weeks, and effects on cholesterol are generally observed after 8 weeks of supplementation.
  • Who benefits most from rice bran according to the research?
    The strongest evidence comes from clinical populations, such as adults with metabolic syndrome, coronary artery disease, or overweight/obesity with cardiometabolic risk factors. Healthy adults have been studied less, and results are less consistent for these groups.
  • Are there caveats or limitations in the research on rice bran?
    Yes. Most studies used rice bran oil rather than whole rice bran, so effects may differ depending on the form. Publication bias is a concern — null-result studies are less likely to be published. The total number of studies is small (3–7 per outcome), so conclusions are preliminary, especially for HDL cholesterol and triglyceride outcomes.
  • Does rice bran help with reducing triglycerides?
    Evidence is moderate for a small reduction in triglycerides. A 2024 meta-analysis of 572 participants found a reduction of -15.13 mg/dL. However, only 3 of 5 studies showed benefit, and many individual studies did not reach statistical significance, suggesting the effect may be modest.
  • Does rice bran raise HDL cholesterol?
    The evidence is weak and mixed. Of 3 studies, 2 showed beneficial effects but a meta-analysis pooling 8 RCTs found no significant effect. Differences in dose, form, and study population may explain the inconsistency. These results should be considered preliminary.

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