Red Yeast Rice
Evidence: StrongUseful mainly for people with mildly-to-moderately elevated LDL cholesterol, including those statin-intolerant.
Quick decision guide
May help most
people with mildly-to-moderately elevated LDL cholesterol, including those statin-intolerant
Common dosing range
1,200–2,400 mg/day standardized to monacolin K
When to expect effects
Weeks (4–8 weeks for lipid changes)
Watch out for
It is a low-dose statin; same muscle, liver, and drug-interaction risks apply, and monacolin content varies widely between products
What is it
Red yeast rice is rice fermented with the mold Monascus purpureus, which produces monacolin K — a compound chemically identical to the prescription statin lovastatin. It is taken to lower LDL cholesterol, and its lipid-lowering activity comes from this naturally occurring statin content.
Is it worth it for you?
Use this as a quick fit check, not a diagnosis.
Worth considering if…
Probably skip if…
Evidence at a glance
| Goal | Evidence | Effect | Best fit | Time |
|---|---|---|---|---|
| ldl cholesterol lowering | Strong Evidence | ~15–25% LDL reduction (~1 mmol/L) | adults with elevated LDL not on a statin | 4–8 weeks |
| secondary cardiovascular event prevention | Limited Evidence | Reduced recurrent events in one large trial | patients with prior coronary events (studied with a Xuezhikang extract) | Months to years |
Evidence for 2 uses
AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.
ldl cholesterol lowering
Biomarker supportMeta-analyses of randomized trials consistently show red yeast rice lowers LDL cholesterol by roughly 15–25%, comparable to a low-dose statin, because monacolin K is biochemically lovastatin. The magnitude depends on the product's actual monacolin K content, which is not standardized across brands.
Bottom line: A reliable LDL-lowering agent because it is effectively a low-dose statin.
secondary cardiovascular event prevention
Disease adjunctThe China Coronary Secondary Prevention Study, using the red yeast rice extract Xuezhikang, reported fewer recurrent coronary events and lower cardiovascular mortality versus placebo in post-MI patients. Evidence rests largely on this single large trial of a specific standardized extract rather than on generic over-the-counter products.
Bottom line: One large trial supports event reduction, but it used a specific standardized extract, not typical supplements.
Evidence is mixed
Strong biomarker evidence, but hard outcome data come essentially from one extract in one population, limiting generalizability.
How to take it
- Typical dose
- 1,200–2,400 mg/day standardized to monacolin K (often ~3–10 mg monacolin K/day)
- Timing
- Evening, consistent with how statins are dosed
- With food
- With food
- Split dosing
- Can split morning and evening
- How long to try
- Recheck lipids at 8–12 weeks
What to track
- LDL cholesterol
- total cholesterol
- liver enzymes (ALT/AST)
- unexplained muscle aches
Safety
Common side effects
muscle aches, digestive upset, headache
Serious risks
- myopathy/rhabdomyolysis (statin class)
- liver enzyme elevation
- possible citrinin contamination (nephrotoxic mycotoxin)
Who should avoid it
- pregnant or breastfeeding women
- people with liver disease
- people already taking a statin
- those on strong CYP3A4 inhibitors
Pregnancy & breastfeeding
Avoid in pregnancy and breastfeeding; statins are contraindicated due to fetal risk.
Interactions
Additive statin exposure raises myopathy and liver-toxicity risk
Raise monacolin K levels, increasing muscle toxicity risk
Increased risk of myopathy when combined with statin-like agents
Statins can potentiate anticoagulant effect
Choosing a product
Look for
- disclosed monacolin K content
- third-party testing for citrinin
- standardized extract
Be skeptical of
- "natural and statin-free" (it contains a statin)
- "no side effects"
- undisclosed proprietary blends with no monacolin assay
References by claim
Track Red Yeast Rice with Pilora
Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.
Coming to App StoreDisclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.