Across all 5 studies, red yeast rice consistently shows beneficial effects on reducing blood cholesterol, with 4 of 5 studies reporting statistically significant findings and effect sizes ranging from small to large. The most commonly studied doses were 200 mg/day and up to 10 mg/day of monacolin K, primarily in adults with hyperlipidemia or dyslipidemia. Effects were typically observed at a median duration of 84 days (12 weeks).
Caveats: Available evidence is overwhelmingly positive — clinical literature in this area is subject to publication bias (null-result studies are less likely to be published or indexed). Study doses varied widely (from 200 mg to 4800 mg daily), and no form data was extracted, making it unclear if different formulations influence outcomes.
did not increase the risk of adverse events in patients with hyperlipidemia
from: Red Yeast Rice for Hyperlipidemia: A Meta-Analysis of 15 High-Quality Randomized ControlleNo severe treatment-related adverse effects on muscles, liver, or renal function were observed.
from: Low dose red yeast rice with monacolin K lowers LDL cholesterol and blood pressure in Japa3 of the included studies reported adverse side effects after treatment with monacolin K.
from: Monacolin K supplementation in patients with hypercholesterolemia: A systematic review ofAll studies indicated a beneficial effect of monacolin supplementation on LDL and total cholesterol levels (p<0.05)
significant effectiveness in lowering TC (WMD: -33.16 mg/dl, 95% CI: -37.69, -28.63, P < 0.001)
The red yeast rice group also exhibited significant decreases in total cholesterol, apolipoprotein B, and blood pressure.
lower levels of plasma ... total cholesterol
RYR effectively synergized nutraceutical to further reduce TC (MD, -31.10; 95% CI, -38.83 to -23.36; p < 0.00001)