We need to put in general knowledge to obtain an answer to this question. Tea leaves that grow in polluted places are less powerful or down the road . say more harmful. Whereas teal leaves found in places where pollution is less proves to be more helpful for health. Hence tea grown at higher altitudes is nice for health e.g. Green tea supplement. White tea is even more effective but is stronger than green tea. One should go for herbal tea that is light on system and helpful often. Other teas do have benefits but harmful effects are about beneficial facts. So opt for herbal tea and live a lot more time!

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