Red Yeast Rice Extract seems to help reduce total cholesterol levels, lower levels of LDL ("bad") cholesterol, increase levels of HDL ("good") cholesterol, and lower levels of unhealthy fats called triglycerides. It contains several compounds collectively known as Monacolins, substances known to lower cholesterol production One of these, "Monacolin K" is a potent inhibitor of HMG-CoA reductase, and is also known as Mevinolin or Lovastatin (Mevacor®, a drug produced by Merck & Co., Inc).

Red Yeast Rice is a unique natural product native to China that’s been used in Asian traditional medical systems since approximately 800 A.D. Produced by fermenting red yeast (Monascus purpureus) with white rice, Red Yeast Rice is commonly used in cooking applications to enhance the color and flavor of foods. Peking Duck is an example of the coloration and flavor imparted by Red Yeast Rice.
NOW® Red Yeast Rice Extract is carefully produced to avoid the presence of citrinin, a sometimes toxic by-product of the fermentation process.

Red yeast rice extract is most often used by those who wish to have healthy cholesterol levels.