Bilberry is also used in connection with vascular and blood disorders and shows positive effects when treating varicose veins, thrombosis, and angina. Bilberry's fruit contains flavonoids and anthocyanin, which serve to prevent capillary fragility, thin the blood, and stimulate the release of vasodilators. Anthocyanin, a natural antioxidant, also lowers blood pressure, reduces clotting and improves blood supply to the nervous system. Bilberry also contains glucoquinine that has the ability to lower blood sugar