For centuries, green tea has been prized for its delicate flavor and exceptional health benefits. Now modern science has revealed the chemistry behind the lore: green tea contains high levels of polyphenols and catechins- highly potent antioxidants. Ruiyuan's teavitatm premium quality green tea extracts are produced in our gmp certified facilities from premium-grade chinese green tea. And, to insure that you get the phytonutrients most responsible for green tea's biological effects, our extracts are standardized for polyphenols, catechins, and caffeine.