Grape seed contains Proanthocyanidins, of which also called "OPCs" for oligomeric procyanidins or "PCOs" for procyanidolic oligomers-are a class of nutrients belonging to the flavonoid family. Proanthocyanidins have antioxidant activity and they play a role in the stabilization of collagen and maintenance of elastin-two critical proteins in connective tissue that support organs, joints, blood vessels, and muscle. Possibly because of their effects on blood vessels, Currency: USD Unit Price: Quantity: Delivery: