Grape seed extract is rich in flavonoids (group of polyphenols) - oligomeric proanthocyanidins (OPCs) and resveratrol - with high antioxidant capacity and cell protective ability.  Resveratrol is the antioxidant in red wine that is believed to be responsible for the low incidence of cardiovascular disease in wine-drinking European countries. Antioxidants have disease-fighting properties that protect cells from harmful free radicals.  To learn more about antioxidants, click here.