NuNaturals Pure Liquid Bilberry is an extract that contains flavonoids and anthocyanin (natural antioxidants), which serve to stop capillary weakness, thin the blood, and stimulate the release of vasodilators. Bilberry can be used to keep your vascular system healthy. Research also indicates that Bilberry may help keep your eyes healthy. Bilberry also contains glucoquinine. Glucoquinine may help maintain healthier blood sugar levels. This highly concentrated extract should not be confused with less potent tinctures or extracts.