Herbal Extract Standardized Maximum Strength Formula for Proper Vision and Nutrition for The Eyes Dietary Supplement 21st Century...For A Healthier Future 100% Vegetarian Formula 21st Century's Bilberry Extract (Vaccinium myrtillus) is standardized to contain 25% Anthocyanosides Flavonoids calculated as Anthocyanidins. Anthocyanosides act as a powerful antioxidant for support and maintenance of normal vision. 21st Century's standardized herbal extracts are thoroughly tested to assure specific levels of the important active ingredients are present for maximum benefit.