Virbac Proanthozone 20 mg for Medium Size Dogs (60 Caps) Anti-free radical product that helps maintain healthy cells throughout the life of your pet Contains bioflavanol (from grape seed extract), one of the most potent antioxidants known to date Bioflavanol scavenges free radicals plus inhibits enzymes that break down collagen Also contains the other well known antioxidants, Vitamin E and Superoxide dismutase Nutrient and Antioxidant Supplement