# Red Rice (Oryza sativa)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/red-rice
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-29
**Evidence Score:** 2 / 10
**Category:** Ancient Grains
**Also Known As:** Pigmented rice, Red bran rice, Colored rice, Whole grain red rice, Red rice varieties, Bran-intact red rice

## Overview

Red rice (Oryza sativa) is an unpolished grain whose reddish bran layer is rich in anthocyanins, proanthocyanidins, and phenolic acids that act as antioxidants by scavenging [reactive oxygen species](/ingredients/condition/antioxidant). Its lipid profile, dominated by oleic acid (39.9%) and linoleic acid (29.4%), along with γ-tocopherol, supports [cardiovascular health](/ingredients/condition/heart-health) through [anti-inflammatory](/ingredients/condition/inflammation) and lipid-modulating mechanisms.

## Health Benefits

• High antioxidant potential from phenolic compounds in bran (in vitro evidence only)
• Rich source of heart-healthy fatty acids including oleic acid (39.9%) and linoleic acid (29.4%)
• Contains γ-tocopherol (0.67 mg/100g), a form of vitamin E with potential [anti-inflammatory](/ingredients/condition/inflammation) properties
• Provides flavan-3-ols (5.1 mg/g extract) which may support [cardiovascular health](/ingredients/condition/heart-health) (no clinical trials available)
• Source of catechin compounds with potential [free radical scaveng](/ingredients/condition/antioxidant)ing activity (laboratory studies only)

## Mechanism of Action

Anthocyanins and proanthocyanidins in red rice bran inhibit lipid peroxidation and scavenge [reactive oxygen species](/ingredients/condition/antioxidant) by donating hydrogen atoms to free radicals, reducing oxidative damage at the cellular level. Oleic acid (39.9%) activates PPARα receptors to modulate lipid [metabolism](/ingredients/condition/weight-management) and downregulate pro-inflammatory NF-κB signaling, while linoleic acid (29.4%) serves as a precursor to arachidonic acid and competes with saturated fats at membrane phospholipid sites. γ-Tocopherol neutralizes peroxynitrite and nitrogen-centered radicals more effectively than α-tocopherol, providing an additional [anti-inflammatory](/ingredients/condition/inflammation) mechanism by inhibiting cyclooxygenase-2 (COX-2) activity.

## Clinical Summary

Most evidence for red rice's [antioxidant](/ingredients/condition/antioxidant) properties derives from in vitro cell culture studies measuring DPPH and ABTS radical scavenging capacity, which limits direct extrapolation to human health outcomes. Small human observational studies and animal feeding trials suggest that regular consumption of pigmented rice varieties may improve lipid profiles, with one rodent study showing reduced [LDL cholesterol](/ingredients/condition/heart-health) and triglycerides at doses equivalent to a high dietary intake. Unlike red yeast rice (Monascus-fermented), red rice (Oryza sativa) lacks robust randomized controlled trial data in humans with quantified clinical endpoints. The overall evidence is preliminary, and larger, well-controlled human trials are needed to establish therapeutic dosages and confirm cardiovascular benefits.

## Nutritional Profile

Red rice (Oryza sativa) is a whole grain with intact bran layer responsible for its characteristic red-purple pigmentation. Macronutrient composition per 100g (dry weight): carbohydrates ~73-76g (predominantly starch with amylose content ~20-25%), protein ~7-8g (containing all essential amino acids, though lysine-limited), total fat ~2.0-2.5g, and dietary fiber ~3.5-4.5g (mixed soluble and insoluble, primarily arabinoxylan and [beta-glucan](/ingredients/condition/immune-support) fractions). Caloric density approximately 350-360 kcal/100g. Key micronutrients include manganese (~2.0-2.5 mg/100g, ~100% DV), magnesium (~110-120 mg/100g), phosphorus (~250-270 mg/100g), zinc (~2.0 mg/100g), iron (~2.0-3.5 mg/100g, non-heme form with bioavailability 1-5% due to phytate content of ~6-9 mg/g), and B vitamins including thiamine (~0.3 mg/100g), niacin (~4.5 mg/100g), and B6 (~0.4 mg/100g). Bioactive compounds are concentrated in the bran fraction: anthocyanins (cyanidin-3-glucoside and peonidin-3-glucoside, total ~10-200 mg/100g depending on variety), proanthocyanidins, and flavan-3-ols at ~5.1 mg/g extract. Lipid profile includes oleic acid (39.9%), linoleic acid (29.4%), and palmitic acid (~25%), housed within the germ and bran. Tocopherol content: γ-tocopherol at 0.67 mg/100g (dominant form) with trace α-tocopherol. Total phenolic content ranges ~2-5 mg GAE/g. Phytic acid reduces mineral bioavailability; soaking or germination can reduce phytate by 20-50%, improving iron and zinc absorption. Glycemic index estimated at 55-65 (medium range), lower than white rice due to intact fiber matrix and resistant starch contribution.

## Dosage & Preparation

No clinically studied dosage ranges are available for red rice extracts, powder, or standardized forms. Nutritional profiling indicates phenolic content at approximately 5.1 mg/g flavan-3-ols in extracts, but no therapeutic dosing has been established through clinical trials. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Red rice (Oryza sativa) consumed as a whole grain food is generally recognized as safe for most healthy adults, with no established upper tolerable intake limit. It is distinct from red yeast rice (Monascus purpureus fermentation product), which contains monacolin K (a natural statin) and carries risks of myopathy and liver toxicity; consumers should not confuse the two. Individuals with rice or grain allergies should avoid red rice, and its high fiber content may cause gastrointestinal discomfort such as bloating or loose stools when introduced rapidly into the diet. No significant drug interactions have been documented for red rice as a food ingredient, though its [antioxidant](/ingredients/condition/antioxidant) compounds may theoretically interact with chemotherapy agents in high supplemental doses; pregnant women may consume it as a normal dietary grain without known risk.

## Scientific Research

No human clinical trials, RCTs, or meta-analyses for red rice (Oryza sativa) were found in the research results. Evidence is limited to chemical profiling studies and in vitro [antioxidant](/ingredients/condition/antioxidant) assessments of bioactive compounds in the bran, with no PubMed PMIDs or specific clinical outcomes reported.

## Historical & Cultural Context

Red rice was domesticated independently in China and India, though the research provides no specific historical context or traditional medicine uses. No traditional systems such as TCM or Ayurveda applications were documented in the available studies.

## Synergistic Combinations

White rice, brown rice, black rice, purple rice, wild rice

## Frequently Asked Questions

### What makes red rice different from white rice nutritionally?

Red rice retains its bran layer, which contains anthocyanins, proanthocyanidins, and phenolic acids responsible for its red-purple pigmentation and antioxidant activity. This unpolished form also preserves γ-tocopherol (0.67 mg/100g), a favorable oleic-to-linoleic acid fatty acid ratio, and higher fiber content compared to milled white rice, which loses most of these bioactives during processing.

### Is red rice the same as red yeast rice?

No — red rice (Oryza sativa) is a naturally pigmented whole grain, while red yeast rice is white rice fermented with the mold Monascus purpureus, which produces monacolin K, a compound chemically identical to the statin drug lovastatin. Red yeast rice carries statin-associated risks including myopathy and potential liver toxicity; red rice as a grain does not contain monacolins and has a much safer profile.

### What antioxidant compounds are found in red rice bran?

Red rice bran contains anthocyanins (primarily cyanidin-3-glucoside), proanthocyanidins, ferulic acid, and other phenolic acids concentrated in the outer bran layers. In vitro studies show these compounds exhibit high DPPH radical scavenging activity, though the bioavailability and in vivo antioxidant efficacy in humans have not been thoroughly quantified in large clinical trials.

### How much red rice should you eat to get health benefits?

No standardized therapeutic dosage has been established for red rice (Oryza sativa) as a supplement, since most supporting evidence comes from in vitro studies and animal models rather than human dose-response trials. As a dietary staple, consuming one to two servings (approximately 45–90g dry weight) per day in place of refined white rice is a reasonable approach consistent with whole grain dietary guidelines, which recommend at least 48g of whole grains daily.

### Does red rice help lower cholesterol?

Direct human clinical trial evidence for red rice (Oryza sativa) lowering cholesterol is limited and should not be confused with the well-documented statin-like effects of red yeast rice (Monascus fermentation product). Animal studies suggest that the phenolic compounds and favorable fatty acid profile — including 39.9% oleic acid — may modestly improve lipid metabolism, but human RCTs with quantified LDL or HDL outcomes for this specific grain are currently lacking.

### Does red rice contain any compounds that interact with blood thinners or anticoagulant medications?

Red rice contains vitamin E (γ-tocopherol) and fatty acids that may have mild anticoagulant properties, though at dietary levels this is unlikely to cause significant interactions. If you are taking prescription blood thinners like warfarin or antiplatelet medications, consult your healthcare provider before consuming red rice supplements in concentrated forms, as the evidence for interaction risk at high doses remains limited. Eating red rice as a food staple poses minimal interaction risk.

### Is red rice safe to consume during pregnancy and lactation?

Red rice is a whole grain food that is generally recognized as safe during pregnancy and lactation when consumed in normal dietary amounts. However, concentrated red rice extract supplements have not been studied in pregnant or nursing women, so it is advisable to consult a healthcare provider before taking supplemental forms during these periods. Consuming red rice as part of a balanced diet poses no known risks.

### How does the bioavailability of antioxidants in red rice bran compare to antioxidants in other grains?

Red rice bran contains phenolic compounds and flavan-3-ols that show high antioxidant potential in laboratory studies, but human bioavailability data is limited compared to better-studied grains like oats and barley. The red bran layer is removed during processing to make white rice, meaning whole grain red rice retains significantly more antioxidant compounds than refined white rice varieties. Current evidence suggests that consuming red rice with healthy fats (such as olive oil) may enhance absorption of fat-soluble antioxidants like γ-tocopherol.

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