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.* Take 1 capsule twice daily with food.