Standardized Grape Seed Extract powder. Botanical Source: Seed of Vitis vinifera L. Appearance: Reddish-Brown Powder Standard: Proanthocyanidin ( OPC) UV Water: not more than 5.0% Package: 25/ KG per paper drum or packed with little parcel. Medicinal Use: The Grape Seed extract is a new type of efficient anti-oxidant, it has the strongest effect among all of the current free radicals clearance and it is very active inside the body.