Red Yeast Rice is a unique natural product that's been used in Asian traditional medical systems since approximately 800 A.D.&ampnbsp; 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.&ampnbsp; Peking Duck is an example of the coloration and flavor imparted by Red Yeast Rice.&ampnbsp; NOW&ampreg; Red Yeast Rice&ampnbsp;is carefully produced to avoid the presence of citrinin, a sometimes toxic by-product of the fermentation process.