Free Radical Protection Vascular Health Healthy Immune Response A Dietary Supplement Vegetarian/Vegan General Health Family Owned Since 1968 GMP Quality Assured NOW Grape Seed Extract is a highly concentrated natural extract with a minimum of 90% Polyphenols, including Oligomeric Proanthocyanidins (OPC's), which are the potent water-soluble free radical scavenging compounds found Grape Seeds. A growing body of research indicates that Grape Seed OPCs may help to support the health of vascular, bone, kidney, brain and other tissues by supporting a healthy, balanced immune response to oxidative and metabolic stress.