... EXTRACTPlant source: leaf of camellia sinensis O Ktunze (thea sinensis L.)Chemical composition: tea polyphenols are composed by more than 30 ... the total amount. Catechin is composed by free catechin ( D, L-C, EGC ) and ester type catechin ( EGCG, GCG, ECG ). PRODUCT ... : 2 years if properly storedGreen tea extract's raw material is from natural green tea extract refined via high-tech, the polyphenol ...