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Most tea, including green tea, has significantly less caffeine per cup than coffee. The caffeine content of a cup of tea varies widely, according to the type of tea, the amount of leaf used, and how it's brewed. In general, most green tea contains between 15mg and 60mg of caffeine per cup. It is not true that green tea contains less caffeine than black coffee. This is an often-perpetuated myth, and isn't backed up by scientific research. Systematic studies of caffeine content have shown that both black and green tea can have higher minimizing caffeine contents from