TeaVivre response: 10/28/2016 Thanks for your question. Usually it don’t produce harmful substances if we don’t drink normal teas(green tea， black tea, pu-erh tea, oolong and white tea) in 2 hours before or after we take pills. But we must inform you that the tea .Green tea is not oxidized (fermented) during its processing, and so its buds and leaves retain much of the naturally occurring chemicals present in the leaves when they grow, which gives green tea its famed health benefits. 2016 New spring tea is now available VIEW NOW >>Two principal varieties are used: Camellia sinensis var. sinensis, which is used for most Chinese, Formosan and Japanese teas, and C. s. var. assamica, used in Pu-erh and most Indian teas (but not Darjeeling). Within these botanical varieties, many strains and .TeaTrends is the leading source of unbiased news and analysis for the specialty tea industry. Sing up for our free weekly newsletter today! . Merril J. Fernando, the founder of Dilmah Tea and one of the most influential figures in the history of tea in Sri Lanka .