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Limited evidenceGut health

Rice Bran

The fibrous outer layer of the rice grain, sold as a fibre and phytonutrient supplement. It is a reasonable food-grade fibre, but the trials aimed at blood lipids came back null.

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What the science says

  • Blood lipids Limited evidence

    A GRADE-assessed meta-analysis of eight randomised trials found no significant effect of rice bran supplementation on triglycerides, total cholesterol, LDL or HDL. Rice bran oil, which is a different product, has better lipid data than the bran itself.

  • Gut microbiota and infant growth Limited evidence

    A randomised trial in weaning infants in Nicaragua and Mali found daily rice bran (1–5 g/day) was feasible and associated with modest improvements in length-for-age z-scores and shifts in stool microbiota and metabolome. The populations were specific and the outcomes were surrogate measures.

  • General fibre intake Limited evidence

    Rice bran supplies insoluble fibre and phytosterols, so it can add bulk to the diet, but no controlled trial shows it outperforms cheaper fibre sources for constipation or stool regularity.

Dosage & safety

Studied doseTrials in adults used roughly 10–30 g/day of stabilised rice bran; the infant trial used 1–5 g/day. Typical label servings are 1–2 tablespoons.
SafetyWell tolerated; mainly causes gas and bloating when introduced quickly. Rice products can carry inorganic arsenic, and bran concentrates it, which is a real consideration for daily long-term use and for children. Not for anyone with a rice allergy.

How to take it

TimingTiming does not matter.
With food?With food, stirred into cereal, yogurt or a smoothie.
Worth knowingRotate it with other brans for daily long-term use, because rice concentrates inorganic arsenic and bran concentrates it further.

Interactions

With other supplements

  • iron, zinc and calcium

    Rice bran is high in phytate, which binds these minerals in the gut. separate mineral supplements by at least 2 hours

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Does rice bran lower cholesterol?

No. A GRADE-assessed meta-analysis of eight randomised trials found rice bran supplementation had no significant effect on triglycerides, total cholesterol, LDL or HDL. Rice bran oil is a different product with better lipid data.

Is rice bran a good fibre supplement?

Rice bran is a reasonable food-grade fibre that adds bulk, but no controlled trial shows it beats cheaper fibre sources for constipation or regularity, so the evidence is limited.

Is rice bran safe to eat every day?

Rice bran concentrates inorganic arsenic, which is a real consideration for daily long-term use and for children, so rotate it with other brans. It mainly causes gas and bloating when introduced quickly.

How much rice bran per day?

Adult trials used roughly 10–30 g/day of stabilised rice bran, and typical label servings are 1–2 tablespoons. Separate iron, zinc and calcium supplements by at least 2 hours, since rice bran phytate binds them.

Scientific references

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