Grape seeds are a rich source of powerful antioxidants called oligomeric proanthocyanidin complexes. Antioxidants help prevent cell damage by neutralizing unstable molecules called free radicals, which are believed to accelerate aging and increase the risk of cardiovascular disease. Grape seed extract also contains vitamin E, flavonoids, linoleic acid and resveratrol, an antioxidant that has gained notoriety as an anti-aging nutrient.