On ordinary, Ceylon black tea is made up of 50mg of caffeine per cup, with versions of Ceylon being better or lower. While other types of black tea regular 47mg of caffeine for each cup. Ceylon handles a variety of teas that fluctuate in caffeine levels. Green is 35mg, https://martinxhral.livebloggs.com/37137433/indicators-on-how-much-caffeine-does-jasmine-green-tea-have-you-should-know