The antioxidants in black tea may counteract the negative effects ... For most people, consuming up to 400 micrograms of caffeine per day is not associated with adverse health effects.
Green tea is less oxidized, has a mildly earthy-grassy flavor, and usually contains less caffeine; while black tea is more oxidized, has a deeper, tannic flavor, and usually contains slightly more ...
Green tea contains an average of 29 milligrams (mg) of caffeine in an 8-ounce cup, but the amount can vary. Black tea typically has more caffeine at 47 mg per 8 ounces. Green tea and black tea are ...