Most green teas provide a total of 240 - 320 mg of polyphenols in 2 - 3 cups which is recommended daily. Or 100-750 mg per day of green tea extract daily is recommended.
Green Tea Leaf (95% extract) (Providing 35 milligrams of naturally-occurring caffeine. Standardized to provide 30% EGCG and 65% Polyphenol Catechins)