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Most tea, including green tea, has significantly less caffeine per cup than coffee. The caffeine content of one cup of tea varies widely, depending within the type of tea, quantity of of leaf used, and how it is brewed. In general, most green tea contains between 15mg and 60mg of caffeine per cup. Is actually usually not correct that green tea contains less caffeine than black toy tea. This is an often-perpetuated myth, and is not backed up by research. Systematic studies of caffeine content have shown that both black and green tea can have higher and lower caffe