Grape Seed Extract Details Product Name: Grape Seed Extract  Herb Source: Vitis vinifera Linn  Part Used: Seed  Active Ingredients: Proanthocyanidins (OPC), Polyphenols  Specifications: Proanthocyanidins 90%,95%,98%; Polyphenols 95%  Test Method: UV, TLC Appearance: Red-brown powder  CAS#: 84929-27-1 Pharmacology: Grape seed extract–OPCs , best known for its anti-oxidant, has been shown to be 20 times greater than Vitamin C & 50 times stronger …