... with very good price and excellent quality:green tea extract tea polyphenols, 50% ; 80% ; 90% ; 95% ; 98%EGCG, 10%-98%catechins, 20-90% ... flavone, flavonol, anthocyania, phenolic acid, and catechin is most high and accounts for 60% --80% of the total amount. ... 2 years if properly storedGreen tea extract's raw material is from natural green tea extract refined via high-tech, the polyphenol content of ...