Green tea extract Specification: polyphenols 20-99% Appearance: brown, light yellow, yellow green powder, bitter taste 1. Green Tea Extract:Plant source: leaf of camellia sinensis O Ktunze (thea sinensis L.)Chemical composition: tea polyphenols are composed by more than 30 component, it has 4 taypes as their chemical construction: catechin, flavone, flavonol, anthocyania, phenolic acid, and ...