Science Based Nutrition Dietary Supplement Benefits Adult Men & Women as Part of a Healthy Lifestyle Plan Suitable for VegetariansBest Red Yeast Rice contains rice that has been naturally fermented with red yeast (Monascus purpureus) according to traditional methods. Produced in the U.S.A., this product is similar to red yeast rice that has been used in culinary applications in Asia since at least 800 A.D. It is considered beneficial for adult men and women when taken as part of a lifestyle program that includes regular exercise and a healthy diet.