T J Clark’s Catalyzed Grape Seed Extract is the most complete grape seed product available. Grape seeds contain the best-known source of one of the most potent antioxidants yet discovered - the catechin polymers, and several proanthocyanidin B compounds. Combined with the synergy of Resveratrol, vitamin C, and our proprietary phytogenic mineral catalyst, our advanced formula provides the most complete protection from oxidative stress and subsequent tissue damage.