Promotes Eye Health. 25% Anthocyanosides Extract Bilberry (Vaccinium myrtillus) is a rich source of anthocyanosides flavanols believed to be responsible for the herb's beneficial properties in promoting overall eye health. These flavanols contain potent antioxidant properties. In addition they play a key role in building healthy connective tissue improving circulation and maintaining normal night time vision. . Standardized extracts are guaranteed to contain a specific quantity of a known marker compound and are laboratory tested to insure consistent potency.