Nature’s Plus Herbal Actives Red Yeast Rice supplement contains 600mg of red yeast rice extract in each capsule. Red yeast rice, also known as Monascus purpureus, is rice that has been fermented by red yeast. Red Yeast Rice contains Monacolin K which naturally helps to balance the ratio of HDL’s to LDL’s by inhibiting the action of HMG-CoA reductase, an enzyme responsible for cholesterol synthesis in the liver.