WHAT'S INSIDE THE CAN Caffeine: Caffeine was widely used by ancient civilizations. It was traditionally consumed from natural sources like tea, coffee, cacao beans and cola nuts and appreciated for its stimulating effects on the human body. B-group vitamins: Vitamins are essential micronutrients that are required for maintaining normal body functions. Sugars: Red Bull Energy Drink is made with real sugars. Taurine: Taurine is an amino acid, naturally occurring in the human body and present in the daily diet.