What's inside the can: Caffeine was well known for its stimulating effects by ancient civilizations who consumed it from natural sources like tea, coffee, cacao beans & cola nuts. Taurine is an amino acid, naturally occurring in the human body and present in commonly consumed foods. It is involved in a wide range of biological processes. B-group Vitamins are essential micronutrients that are required for maintaining normal body functions. Sucrose and glucose are different types of sugars which are also contained in commonly consumed foods. Water, naturally, water is a key ingredient of Red Bull.