Red yeast rice lowers LDL cholesterol in trials because it contains monacolin K, and PubMed lists 129 trials on it. Monacolin K is the same molecule as the drug lovastatin, and 5 product surveys found its amount varies widely between bottles.
This page explains what the fermented rice is, what it can and cannot do, and what a label like ours leaves out.
Quick Answer: What Is Red Yeast Rice Good For?
Red yeast rice is rice fermented with Monascus purpureus mold. Its monacolin K is chemically identical to lovastatin, a prescription statin. Pooled trials show LDL falls about 34 to 39 mg/dL, but only with products of known monacolin content. US products vary from 0 to about 11 mg per daily serving, and labels rarely say which.
Key Takeaways
- Its active compound, monacolin K, matches the statin drug lovastatin in 1 form.
- Pooled trials found LDL fell about 34 to 39 mg/dL versus control.
- 28 US brands supplied between 0 and 10.94 mg of monacolin K daily.
- A 2023 trial found a store-bought product no better than placebo for LDL.
- Never take it with a prescribed statin; both are 1 drug class.
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What Red Yeast Rice Actually Is
Red yeast rice is cooked rice fermented with the mold Monascus purpureus. During fermentation the mold makes a family of compounds called monacolins, and one of them behaves like a cholesterol drug.
- Source: A mold, Monascus purpureus, despite the word yeast.
- Main active: Monacolin K, 1 of 14 monacolins described.
- Target: HMG-CoA reductase, the liver enzyme statins block.
- By-products: Pigments and, in some strains, the toxin citrinin.
- Japanese name: Beni-koji, the term used in 2024 kidney reports.
A 2010 product study described 14 active monacolins in red yeast rice.[1]Marked variability of monacolin levels in commercial red yeast rice products — Archives of Internal Medicine (2010) View source A 2021 JACC review calls monacolin K a weak, reversible inhibitor of the enzyme statins block.[2]Red Yeast Rice for Hypercholesterolemia: JACC Focus Seminar — Journal of the American College of Cardiology (2021) View source
Blocking that enzyme is what lowers cholesterol, and the size of the effect is laid out in how far red yeast rice lowers LDL.
Monacolin K Is Lovastatin
This is the fact the rest of the subject rests on, and regulators state it plainly.
- EFSA, 2018: Monacolin K in lactone form is identical to lovastatin.
- FDA: Lists monacolin K as also known as lovastatin, the drug in Mevacor.
- FDA category 4: Excluded from the dietary supplement definition.
- NCCIH: Products with more than trace monacolin K are unapproved new drugs.
EFSA also judged that supplement intakes can reach the therapeutic range of lovastatin.[3]Scientific opinion on the safety of monacolins in red yeast rice — EFSA Journal (2018) View source FDA's ingredient directory lists the classification.[4]Information on Select Dietary Supplement Ingredients: Red Yeast Rice — U.S. Food and Drug Administration View source
NCCIH adds that consumers cannot know the monacolin K content of a product.[5]Red Yeast Rice — National Center for Complementary and Integrative Health View source
Does It Lower Cholesterol?
Yes, in trials that used products with a known monacolin content. The pooled estimates agree closely.
| Meta-analysis | LDL versus control | Note |
|---|---|---|
| 2014, 13 trials, 804 people | Down 0.87 mmol/L, about 34 mg/dL | Xuezhikang excluded |
| 2015, 20 trials | Down 1.02 mmol/L, about 39 mg/dL | Same as statin comparators; safety data weak |
| 2023, randomized trials | Down 28.9 mg/dL | Triglycerides down 23.4 mg/dL |
The 2015 analysis found the LDL drop no different from statin comparators, while rating most safety data weak.[6]Red yeast rice results in significant LDL reduction but safety is uncertain: a systematic review and meta-analysis — Atherosclerosis (2015) View source Most trial products were standardised, which matters for the next section.
Why Two Bottles Are Not the Same Product
Trial products and shelf products are different things. Five independent surveys measured what bottles actually contain.
| Product survey | What was tested | What testing found |
|---|---|---|
| 2001, United States | 9 products | Total monacolins 0% to 0.58% by weight; citrinin in 7 |
| 2010, United States | 12 products, each labelled 600 mg | Monacolin K 0.10 to 10.09 mg per capsule; citrinin high in 4 |
| 2014, United States | 14 supplements | Monacolin K 0.03 to 2.18 mg per 600 mg |
| 2017, United States | 28 brands | None in 2; 0.09 to 5.48 mg per 1,200 mg in the rest |
| 2021, European Union | 37 products | Citrinin in all 37; label content off in 33 |
The 2017 survey found daily monacolin K ranged more than 120-fold across 28 brands.[7]Variability in strength of red yeast rice supplements purchased from mainstream retailers — European Journal of Preventive Cardiology (2017) View source
A 2023 trial then gave a store-bought product to people at raised heart risk for 28 days, and LDL did not differ from placebo.[8]Comparative Effects of Low-Dose Rosuvastatin, Placebo, and Dietary Supplements on Lipids — Journal of the American College of Cardiology (2023) View source How to judge a product against that spread is in how much monacolin K a bottle really holds.
What Is in Our Capsule
Our product is a blend, and its label states 1 amount only.
| Component | Amount on the label | Note |
|---|---|---|
| Red yeast rice | 600 mg | The only ingredient with an amount |
| Liver Safeguard blend: milk thistle seed, dandelion root, turmeric root, reishi, ginger root, burdock root, shiitake, artichoke, yellow dock | Not stated per herb | About 400 mg combined, by subtraction from 1,000 mg |
| Monacolin K | Not stated | Not on the label |
The Liver Safeguard name describes the herb blend. No trial has tested whether these herbs prevent the liver effects of monacolin K, and turmeric, 1 of the 9, has its own series of 10 liver injury cases.[9]Liver Injury Associated with Turmeric: Ten Cases from the Drug-Induced Liver Injury Network — American Journal of Medicine (2023) View source
On those terms, our red yeast rice blend is a 600 mg serving of fermented rice with an unstated monacolin dose. It is not a cholesterol medicine and not a substitute for one.
Heart Events: One Trial, One Extract
One large trial counted heart attacks rather than cholesterol, and it is often quoted beyond what it tested.
- Who: Nearly 5,000 Chinese adults after a heart attack.
- Product: Xuezhikang, a partially purified red yeast rice extract.
- Length: 4.5 years on average.
- Result: Major coronary events 5.7%, against 10.4% on placebo.
That is a 45% relative reduction.[10]Effect of Xuezhikang, an extract from red yeast Chinese rice, on coronary events — American Journal of Cardiology (2008) View source It belongs to 1 standardised extract, not to supplements in general.
Safety in Brief
The risks follow from the chemistry: what a statin can do, enough monacolin K can do.
- Muscle: Aches, and rarely rhabdomyolysis.
- Liver: Rare drug-induced hepatitis.
- Kidneys: Citrinin contamination, and 192 Japanese cases linked to beni-koji tablets.
- Interactions: The same types as statins, including grapefruit juice.
- Pregnancy: Not recommended, with 0 safety studies.
LiverTox rates red yeast rice a probable rare cause of clinically apparent liver injury.[11]Red Yeast Rice, LiverTox — National Institute of Diabetes and Digestive and Kidney Diseases View source The full list, with who should avoid it, is in the muscle, liver and interaction risks.
Speak to a Clinician Before Taking Red Yeast Rice If
- You take a prescribed statin or any other cholesterol medicine
- You are pregnant, trying to conceive or breastfeeding
- You have liver or kidney disease, or drink alcohol heavily
- You take cyclosporine, or medicines your pharmacist flags for lovastatin
- You have had muscle pain, weakness or dark urine on a statin before
Frequently Asked Questions
What are the potential health benefits of taking red yeast rice supplements? +
The one with trial support is lower LDL cholesterol, about 34 to 39 mg/dL in pooled trials. That depends on monacolin K content, which most labels do not state.
What is the downside of taking red yeast rice? +
Statin-type risks to muscle and liver, plus contamination such as citrinin. In 2017, 28 US brands varied more than 120-fold in daily monacolin K.
What do Chinese use to lower cholesterol? +
Xuezhikang, a partially purified red yeast rice extract, is used in China. Its 4.5-year trial in nearly 5,000 heart attack survivors cut major coronary events from 10.4% to 5.7%.
Does red yeast rice still contain monacolin K? +
Most products do, in very different amounts. A 2017 survey found none in 2 of 28 brands and 0.09 to 5.48 mg per 1,200 mg in the rest.
Which foods contain monacolin K? +
Red yeast rice is the food source studied, made by fermenting rice with 1 mold, Monascus purpureus. How much forms depends on the strain and fermentation conditions.
What is red yeast rice made from? +
Cooked rice fermented with Monascus purpureus, a mold rather than a yeast. A 2010 study described 14 monacolins produced during that fermentation.
How many studies are there on red yeast rice? +
PubMed holds 977 records on red yeast rice, monacolins or Xuezhikang. Of those, 129 are tagged as clinical trials and 48 as case reports.
What is in Remedy's red yeast rice capsule? +
600 mg of red yeast rice plus a 9-herb Liver Safeguard blend, 1,000 mg in total. Monacolin K content is not stated on the label.
Does Liver Safeguard protect the liver from red yeast rice? +
No trial has tested that. The blend contains 9 herbs, and 1 of them, turmeric, has its own published reports of liver injury.
Is red yeast rice the same as red rice? +
No. Red yeast rice is rice fermented with 1 specific mold, which produces the monacolins. Red rice is a naturally pigmented grain that is not fermented this way.
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