Green Tea Extract Powder Specification:Polyphenols 20%-98% EGCG 10%-95%,Catechins 10%-90% Excellent quality, ... supply all the specifications of Green tea extract powder. 1. Polyphenols 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, 98 ... 1%, 5%, 8% HPLC All combinations for Polyphenols, Catechins, EGCG, Caffeine. For example, Polyphenols 95%+Catechins 70%+EGCG 40%+Caffeine 5% Specification ...