Quality product, competitive price Specifications can supply: Tea polyphenol: 20%-98%, EGCG: 10%-99%, Catechin: 30%-90% ... Amino acids, Vitamins,etc. Test Method: HPLCSpecifications can supply: Tea polyphenol: 20%-98%, EGCG: 10%-99%, Catechin: 30%-90%Medical ... antioxidants: either in Antioxidizing, security, or use cost, Tea polyphenol is obviously better than synthetic antioxidants, eg: BHA, BHT, ...