Red Yeast Rice

Red Yeast Rice

Red Yeast Rice

Common Names

  • Angkak; Beni-koji; Hong Qu; Hung-chu; Monascus; Red Koji; Red Leaven; Red Rice; Red yeast ; Zhitai; Zue Zhi Kang

For Patients & Caregivers

Bottom Line: Red yeast rice appears to lower blood cholesterol and triglyceride levels with few side effects, but there is no evidence that it can treat cancer.

Little is known about the way red yeast rice works. One of its constituents, monacolin K, also known as lovastatin, is an active ingredient in the cholesterol-lowering drug, Mevacor®. The drug works by inhibiting an enzyme essential for the creation of cholesterol in the body; therefore it is assumed that red yeast rice works through a similar mechanism.

  • To lower high cholesterol
    A few clinical trials show that the use of red yeast rice can reduce cholesterol and triglyceride levels in the blood.

High Cholesterol:
This study was conducted to find out if red yeast rice can lower hypercholesterolemia. Seventy-nine patients with hypercholesterolemia (aged 23-65 years) were randomized to receive a twice-daily dose of 600 mg red yeast rice or placebo for 8 weeks. The reduction in low-density lipoprotein cholesterol levels, total cholesterol/high-density lipoprotein cholesterol, low-density lipoprotein cholesterol/high-density lipoprotein cholesterol and apolipoprotein B/apolipoprotein A-I ratios was significantly greater in the treatment group compared to those who took placebo.

  • Citrinin, a toxic fermentation byproduct, has been found in a number of preparations of red yeast rice.
  • Grapefruit juice may increase the effects of red yeast rice.
  • Stomach ache
  • Dizziness
  • Flatulence
  • Heartburn
  • Myopathy (muscular disease resulting in muscle weakness)
  • Case: A sixty-three year old woman developed severe hypertransaminasemia following use of Equisterol, an over-the-counter lipid-lowering product containing guggulsterol and red yeast rice extract, for six months. Her symptoms normalized after equisterol was discontinued.
  • Case: A 62-year-old woman developed severe hepatitis following use of red yeast rice capsules for approximately 4 months before admission. Her condition improved after discontinuing red yeast rice.

The U.S. Food and Drug Administration declared that the dietary supplement Cholestin, manufactured by Pharmanex, cannot be marketed as a dietary supplement because it contained the same active ingredient as Mevacor®, an approved prescription drug.

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For Healthcare Professionals

Cholestin3 ™
Monascus purpureus

Used in China as food and medicine for thousands of years, red yeast rice is the fermented product of the fungus, Monascus purpureus, grown on rice. It was first marketed as a dietary supplement in the United States by Pharmanex under the trade name Cholestin (1). The active constituent, monacolin K, is the same as lovastatin, an active ingredient in the cholesterol-lowering drug, Mevacor® (2).
A number of clinical trials have demonstrated effectiveness of red yeast rice preparations in reducing cholesterol levels in hyperlipidemic patients (3)(4)(5)(14)(15)(16)(17). But an extract of red yeast rice did not lower blood pressure in hypertensive patients (20).
Several preparations of red rice yeast contain citrinin, a toxic fermentation byproduct (6).

  • High cholesterol
  • Rice starch
  • Fiber
  • Protein
  • Moisture
  • Ash
  • Phosphorus
  • Trace elements: calcium, aluminum, iron, manganese, magnesium, copper and silver
  • Monacolin I-VI, Monacolin K (Lovastatin), Dihydromonacolin Fatty Acids: palmitic, stearic, oleic, linoleic, linolenic (4)(6)

Components such as citrinin, monacolines and monankarin, and monascopyridines have been isolated from red yeast rice (10). Fermentation products are standardized to contain 0.4% 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase inhibitors. HMG-CoA reductase is the rate-limiting enzyme in endogenous cholesterol biosynthesis (1). The principal HMG-CoA reductase inhibitor is monacolin K, also known as lovastatin (11). Lovastatin is also an active ingredient in the cholesterol-lowering drug, Mevacor® (2).

Little is known about the absorption, metabolism and excretion of red rice yeast. Lovastatin is partially metabolized by Cytochrome P450 3A4 (9).

  • Citrinin, a toxic fermentation byproduct, was found at measurable concentrations in a number of preparations of red yeast rice (6).
  • Grapefruit juice may increase the effects of red yeast rice (9).

Reported: stomachache (3), heartburn, dizziness and flatulence (7), and several cases of myopathy (21)
Case: Anaphylaxis in a 26-year-old man cooking with red yeast rice has been reported (8). In addition, rhabdomyolysis in a 28-year-old renal transplant recipient has also been reported (12).
Case: A sixty-three year old woman developed severe hypertransaminasemia following use of Equisterol, an over-the-counter lipid-lowering product containing guggulsterol and red yeast rice extract, for six months. Her symptoms normalized after equisterol was discontinued (18).
Case: A 62-year-old woman developed severe hepatitis following use of red yeast rice capsules for approximately 4 months before admission. Her condition improved after discontinuing red yeast rice (19).

  • Coenzyme Q10: Red yeast rice contains lovastatin which has been shown to lower coenzyme Q10 levels (13).

Huang CF, Li TC, Lin CC, et al. Efficacy of Monascus purpureus Went rice on lowering lipid ratios in hypercholesterolemic patients. Eur J Cardiovasc Prev Rehabil. 2007;14(3):438-40.
This study was conducted to determine the effectiveness of red yeast rice in lowering hypercholesterolemia. Seventy-nine patients with hypercholesterolemia (aged 23-65 years) were randomized to receive a twice-daily dose of 600 mg red yeast rice or placebo for 8 weeks. The reduction in low-density lipoprotein cholesterol levels, total cholesterol/high-density lipoprotein cholesterol, low-density lipoprotein cholesterol/high-density lipoprotein cholesterol and apolipoprotein B/apolipoprotein A-I ratios was significantly greater in the treatment group compared to those who took placebo.
Red yeast rice may be an effective agent in reducing lipid ratios in patients with hypercholesterolemia.


  1. Schulz V, Hansel R, Tyler VE. Rational Phytotherapy: A Physician’s Guide to Herbal Medicine. New York: Springer, 2001.

  2. FDA Talk Paper. FDA determines Cholestin to be an unapproved drug.T98-28. May 20, 1998. Accessed March 1, 2013.

  3. Wang J, et al. Multicenter clinical trial of the serum lipid-lowering effects of a Monascus purpureus (red yeast) rice preparation from traditional Chinese medicine. Current Therapeutic Research, Clinical & Experimental 1997 58(12):964-978.

  4. Keithley JK, Swanson B, Sha BE, Zeller JM, Kessler HA, Smith KY. A pilot study of the safety and efficacy of cholestin in treating HIV-related dyslipidemia. Nutrition 2002;18:201-4.

  5. Thompson Coon JS, Ernst E. Herbs for serum cholesterol reduction: a systematic review. J Fam Pract 2003 Jun;52(6):468-78.

  6. Wigger-Alberti W, Bauer A, Hipler UC, Elsner P. Anaphylaxis due to Monascus purpureus—fermented rice (red yeast rice). Allergy 1999;54:1330-1.

  7. Kantola T, Kivisto KT, Neuvonen PJ. Grapefruit juice greatly increases serum concentrations of lovastatin and lovastatin acid. Clin Pharmacol.Ther. 1998;63:397-402.

  8. Wild D, Toth G, Humpf HU. New monascus metabolites with a pyridine structure in red fermented rice. J Agric Food Chem. 2003;51:5493-6.

  9. Chang YN, Lin YC, Lee CC, Liu BL, Tzeng YM. Effect of rice—glycerol complex medium on the production of Lovastatin by Monascus ruber. Folia Microbiol.(Praha) 2002;47:677-84.

  10. Prasad GV, Wong T, Meliton G, Bhaloo S. Rhabdomyolysis due to red yeast rice (Monascus purpureus) in a renal transplant recipient. Transplantation 2002;74:1200-1.

  11. Ghirlanda G, Oradei A, Manto A, Lippa S, Uccioli L, Caputo S et al. Evidence of plasma CoQ10-lowering effect by HMG-CoA reductase inhibitors: a double-blind, placebo-controlled study. J Clin Pharmacol. 1993;33:226-9.

  12. Lin CC, Li TC, Lai MM. Efficacy and safety of Monascus purpureus Went rice in subjects with hyperlipidemia. Eur J Endocrinol 2005;153(5):679-86.

  13. Huang CF, Li TC, Lin CC, et al. Efficacy of Monascus purpureus Went rice on lowering lipid ratios in hypercholesterolemic patients. Eur J Cardiovasc Prev Rehabil. 2007;14(3):438-40.

  14. Becker DJ, Gordon RY, Morris PB, et al. Simvastatin vs therapeutic lifestyle changes and supplements: randomized primary prevention trial. Mayo Clin Proc. 2008;83(7):758-64.

  15. Becker DJ, Gordon RY, Halbert SC, et al. Red yeast rice for dyslipidemia in statin-intolerant patients: a randomized trial. Ann Intern Med 2009;150(12):830-9, W147-9.

  16. Roselle H, Ekatan A, Tzeng J, Sapienza M, Kocher J. Symptomatic hepatitis associated with the use of herbal red yeast rice. Ann Intern Med. 2008 Oct 7;149(7):516-7.

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