Bilberries contain over 15 different naturally occurring anthocyanosides: Flavonoids that contain powerful antioxidant properties. These anthocyanins help to improve eye function. They help with eye fatigue, which can lead to eye strain, headaches, shoulder tension and blurred double vision. Anthocyanosides also prevent the oxidation of "bad cholesterol". which is a primary risk factor for plaque build up in blood vessels. it also contains tannins that reduce intestinal inflammation and has been used since ancient times to heal stomach ulcers. Bilberries are also a traditional remedy in lowering blood sugar levels.