, taurine (0.4%), glucuronolactone (0.24%), caffeine (0.03%), inositol , vitamins ( niacin , pantothenic acid , B6 , B12 ), flavourings , and colours ( caramel , riboflavin ). CBC claims laboratory tests of 80 mg of caffeine and 1000 mg of taurine in a standard 250ml can of Red Bull energy drink.