We can supply: 1.polyphenolextracted from green tea leaves with polyphenol:20%--99%, EGCG:min.20%; catechin:min.25%; caffeine:max.8%, widely used in food and non-food industry. Note: EGCG over 95% also available. Visual/soluble/stable: Light yellow—light brown powder with character odour and taste, soluble in water and ethanol. Stable in PH4-6, oxidized in strong acid, alkali, sunlight, overheat ...