Grape seed extract is a kind of polyphenols extracted and isolated from grape seeds, mainly composed of proanthocyanidins, catechins, epicatechins, gallic acid, epicatechin gallic ester and other polyphenols.Antioxidant capacity

Grape seed extract is a natural substance, which is one of the most effective plant-derived antioxidants found so far. Experiments show that its antioxidant effect is 30 to 50 times that of vitamin C and vitamin E.

Proanthocyanidins have strong activity, which can inhibit carcinogens in cigarettes. The ability to capture free radicals in water phase is 2-7 times that of general antioxidants, and the activity of proanthocyanidins is more than two times higher than that of α-tocopherol.