On average, Ceylon black tea is made up of 50mg of caffeine for every cup, with variations of Ceylon becoming higher or reduce. Whilst other types of black tea common 47mg of caffeine for every cup. Ceylon covers several different teas that differ in caffeine degrees. Green is 35mg, https://how-do-you-make-bubble-te93681.thekatyblog.com/29983759/getting-my-does-sunflower-jasmine-tea-have-caffeine-to-work