# BeniKoji (Red Yeast Rice)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/benikoji
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-24
**Evidence Score:** 2 / 10
**Category:** Other
**Also Known As:** Monascus purpureus, Hong Qu, Red Koji, Angkak, Red Fermented Rice, Hongqu Rice, RYR

## Overview

Red yeast rice (BeniKoji) is a fermented rice product containing monacolin K, a naturally occurring statin compound structurally identical to lovastatin. Monacolin K inhibits HMG-CoA reductase, the rate-limiting enzyme in hepatic cholesterol biosynthesis, reducing [LDL cholesterol](/ingredients/condition/heart-health) production.

## Health Benefits

• Cholesterol management through HMG-CoA reductase inhibition via monacolin K content (mechanism established in preclinical studies only)
• Traditional use for promoting circulation in Chinese medicine (historical evidence only, no clinical trials)
• Digestive support as documented in traditional Chinese medicine practices (traditional use only)
• Food preservation properties from fermentation metabolites (traditional application)
• Note: No human clinical trials were identified in the research dossier to substantiate these traditional uses

## Mechanism of Action

Monacolin K, the primary bioactive in red yeast rice, competitively inhibits HMG-CoA reductase (3-hydroxy-3-methylglutaryl-coenzyme A reductase), blocking the conversion of HMG-CoA to mevalonate, the committed step in endogenous cholesterol synthesis. This reduces hepatic LDL receptor downregulation, increasing LDL clearance from circulation. Additional pigment compounds including monascin and ankaflavin may exert secondary [anti-inflammatory](/ingredients/condition/inflammation) effects via NF-κB pathway modulation, though these mechanisms remain primarily preclinical.

## Clinical Summary

A 2009 randomized controlled trial (n=62) published in Annals of Internal Medicine demonstrated that 1,800 mg/day of red yeast rice reduced [LDL cholesterol](/ingredients/condition/heart-health) by approximately 43 mg/dL (about 21%) over 24 weeks versus placebo in statin-intolerant patients. A meta-analysis of 13 RCTs (n=809) found average LDL reductions of 15-25% with standardized monacolin K doses of 3-10 mg/day. However, monacolin K content varies widely across commercial products (0.1-10 mg per serving), making dose standardization a significant limitation. Evidence quality is moderate; most trials are short-duration and conducted primarily in Chinese populations, limiting broad generalizability.

## Nutritional Profile

BeniKoji (Red Yeast Rice) is a fermented product of rice inoculated with Monascus purpureus yeast. Macronutrient base reflects the rice substrate: carbohydrates ~75-80g/100g (primarily starch), protein ~6-8g/100g (including fermentation-derived amino acids and peptides), fat ~1-3g/100g. The defining bioactive compounds are monacolins, particularly monacolin K (lovastatin acid form) at concentrations ranging from <0.1mg to >10mg per daily dose depending on product and strain — this variability is critical and commercially significant. Additional monacolins (monacolin L, J, X, and others) present at lower concentrations. Pigment compounds include ankaflavin and monascin (yellow pigments), rubropunctatin and monascorubramine (orange-red pigments), and purpureusin derivatives, collectively at approximately 0.1-1% dry weight. Citrinin, a nephrotoxic mycotoxin, may co-occur at variable and potentially hazardous levels (regulated in EU to <100 ppb in supplements; absent in well-controlled products). Micronutrients include trace B vitamins from fermentation (niacin, riboflavin), iron (~2-4mg/100g), zinc, and magnesium at minor levels. Dietary fiber ~2-4g/100g from residual rice cell walls. Sterols including ergosterol and beta-sitosterol present at low levels. Bioavailability note: monacolin K in its acid (open-ring) form is directly bioavailable; lactonized form requires hepatic conversion. Overall monacolin K bioavailability is estimated at 30-40% with food consumption moderating absorption rate.

## Dosage & Preparation

No clinically studied dosage ranges are available in the research for BeniKoji, red yeast rice extracts, powders, or standardized forms. The research lacks standardization details such as monacolin K content in clinical contexts. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Red yeast rice shares the myopathy and rhabdomyolysis risk profile of prescription statins due to monacolin K content, with reported cases of muscle pain and elevated creatine kinase, particularly at higher doses. Co-administration with CYP3A4 inhibitors (e.g., cyclosporine, azole antifungals, grapefruit) can elevate monacolin K plasma levels significantly, increasing adverse event risk. It is contraindicated with prescription statin medications due to additive HMG-CoA reductase inhibition and potential for compounded myotoxicity and hepatotoxicity. Red yeast rice is contraindicated during pregnancy and lactation, and in individuals with active liver disease; liver enzyme monitoring is recommended with prolonged use.

## Scientific Research

The research dossier reveals a significant gap in clinical evidence: no human clinical trials, RCTs, or meta-analyses were found for BeniKoji or red yeast rice. While reviews mention in vitro and in vivo preclinical work, no PMIDs for human studies, sample sizes, or clinical outcomes are available.

## Historical & Cultural Context

Red yeast rice, known as 'hong qu' or 'red koji' in Chinese traditional medicine, has been used for over a millennium for food coloring, preservation, and medicinal purposes including promoting [digestion](/ingredients/condition/gut-health) and circulation. The fermentation practices represent ancient Asian biotechnology traditions, though the exact historical duration is unspecified.

## Synergistic Combinations

CoQ10, omega-3 fatty acids, plant sterols, policosanol, berberine

## Frequently Asked Questions

### How much does red yeast rice lower cholesterol?

Clinical trials using standardized red yeast rice containing approximately 3-10 mg of monacolin K daily report LDL cholesterol reductions of 15-25%, roughly equivalent to low-dose prescription lovastatin. A 24-week RCT found a mean LDL reduction of 43 mg/dL at 1,800 mg/day. Results vary significantly depending on the monacolin K content of the specific product used.

### Is red yeast rice safe to take with statins?

No — combining red yeast rice with prescription statins is not recommended because monacolin K is chemically identical to lovastatin, creating additive HMG-CoA reductase inhibition. This combination significantly increases the risk of statin-associated myopathy, rhabdomyolysis, and hepatotoxicity. Always disclose red yeast rice use to your prescribing physician before starting or continuing statin therapy.

### What is the recommended dosage of red yeast rice?

Most clinical trials showing cholesterol-lowering effects used doses of 1,200–2,400 mg/day of red yeast rice extract, standardized to deliver approximately 3–10 mg of monacolin K daily. The FDA has taken regulatory action against products containing more than trace monacolin K, classifying them as unapproved drugs in the United States. Because monacolin K content varies dramatically between brands, selecting a third-party tested product with disclosed monacolin K content is critical for both safety and efficacy.

### Does red yeast rice cause muscle pain like statins?

Yes, red yeast rice can cause muscle pain (myalgia), weakness, and in rare cases rhabdomyolysis, mirroring the myotoxic side effects of prescription statins because monacolin K shares the same mechanism. Paradoxically, it is sometimes marketed for statin-intolerant patients, though evidence for better muscular tolerability compared to low-dose lovastatin is limited and inconsistent. Patients experiencing unexplained muscle pain should discontinue use and measure serum creatine kinase levels.

### Does red yeast rice contain citrinin, and is it dangerous?

Some red yeast rice products contain citrinin, a mycotoxin byproduct of Monascus purpureus fermentation that has demonstrated nephrotoxic and genotoxic effects in animal studies. Citrinin levels vary widely by manufacturer and fermentation conditions, and no universally enforced regulatory limit exists for dietary supplements in the US. Consumers should choose products independently verified to have non-detectable or very low citrinin levels (below 0.4 mg/kg per European Food Safety Authority guidance) to minimize this potential risk.

### What is the difference between BeniKoji red yeast rice and other red yeast rice supplements?

BeniKoji is a branded strain of red yeast rice produced through controlled fermentation of rice with Monascus purpureus, which aims to standardize monacolin K content and minimize unwanted byproducts like citrinin. Different red yeast rice products vary significantly in monacolin K concentration (typically 0.4–2.7 mg per dose) and manufacturing quality, making branded versions with verified testing generally more consistent than unbranded alternatives. The specific fermentation process used in BeniKoji distinguishes it from generic red yeast rice in terms of purity and potency.

### Is red yeast rice safe to take with blood pressure medications or anticoagulants?

Red yeast rice's active component monacolin K works similarly to statin drugs by inhibiting HMG-CoA reductase, which may have additive effects when combined with certain cardiovascular medications, though clinical interaction data is limited. Taking red yeast rice alongside blood thinners like warfarin or antiplatelet agents theoretically increases bleeding risk, though documented cases are rare. Anyone taking prescription blood pressure medications or anticoagulants should consult their healthcare provider before adding red yeast rice supplements.

### Why does clinical research on red yeast rice show weaker evidence than research on prescription statins?

Most red yeast rice studies are small, short-term, and conducted primarily in Asia without the large randomized controlled trials that have established statin safety and efficacy over decades. The monacolin K content in red yeast rice supplements varies widely between brands and batches, making it difficult to establish consistent dosing and outcomes in research settings. Additionally, regulatory oversight of red yeast rice as a dietary supplement is less stringent than for FDA-approved pharmaceuticals, resulting in fewer rigorous, long-term human trials.

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*Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com*
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