Skyherb is a Kosher, ISO, FoodGMP and QS certificated leading manufacturer of botanical extract in China. We keep researching and producing Grape seed extract for many years and can provide our customers high quality product in large quantity. Product Description: Main Components: Polyphenols, Proanthocyanin Skyherb can provide the specifications of Grape seed extract as follow: Proanthocyanidins: 95 Polyphenols: 80%, 85%, 95% Please feel free to contact us for more details.