NOW® Grape Seed Extract is a highly concentrated extract with a minimum of 90% Polyphenols, including Oligomeric Proanthocyanidins (OPCs), which are the potent water-soluble free radical scavenging compounds found in 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 immune response to normal oxidative and metabolic stress.* Vitamin C has been added for its antioxidant power.* Natural color variation may occur in this product.