4,729 patients undergoing hormonal and pro-cyanidol oligomer therapy. No definite side effects unless the tea with caffeine is consumed. There are no significant drug interactions. Green tea is derived from the tea plant, Camellia sinensis, through light steaming of the leaves. Allowing the leaves to oxidize produces black tea.
Green tea contains polyphenols, mainly flavonoids.
They inhibit the formation of carcinogenic substances such as nitrosamines, suppress their activation, and detoxify them. Yang CS and Wang ZY, Tea and cancer.