... 2. Polyphenol, procyanidin, Resveratrol. 3. UV/HPLC Test 4. GMP Factory 5. Quick Shipment Name: Grape Seed Extract, Grape Skin ... Extract, Wild Grape Extract PowderPlant Origin: Vitis vinifera LUsed ... , polyphenolAppearance:Red brown powder Grape seed extract polyphenols: 1. 95% by UV, folin assay 2. 95% polyphenols with 15% phenolic ...