A cup of green tea has all over 28 milligrams (mg) of caffeine, which places it somewhat guiding black tea’s 47 mg, in accordance with the Mayo Clinic. Even so, there can be a great deal of variation in caffeine articles based upon how tea is processed and brewed. https://www.goteaworld.com/arizona-green-tea-is-it-good-for-you-5-facts/