... the following product with very good price and excellent quality:green tea extract tea polyphenols, 50% ; 80% ; 90% ; 95% ; 98%EGCG ... composed by free catechin ( D, L-C, EGC ) and ester type catechin ( EGCG, GCG, ECG ).Spec: 50% 60% 70% 80% 90 ... % 60% 70%Test method: HPLC UVAppearance: brown, light yellow, yellow green powder, bitter tasteInner packing: double-layer plastic bagOuter packing: export ...