Red Bull Sugarfree\'s special formula contains ingredients of high quality: Caffeine, Taurine, B-Group Vitamins, Aspartame & Acesulfame K, Alpine water One 250ml can of Red Bull Sugarfree contains 80 mg of caffeine, about the same amount as in a cup of home-brewed coffee. When to Drink Red Bull Energy Drink is appreciated worldwide by top athletes, students, and in highly demanding professions as well as during long drives. What\'s Inside The Can Caffeine: Caffeine was already known by ancient civilisations. They consumed it from natural sources like tea, coffee, cacao beans and cola nuts and appreciated its stimulating effects on the human body. B-group vitamins: Vitamins are essential micronutrients that are required for maintaining normal body functions. Taurine: Taurine is an amino acid, naturally occurring in the human body and present in the daily diet. It is involved in a wide range of biological processes. Aspartame & Acesulfame K: Aspartame and Acesulfame K are among the most-tested and most-used sugar substitutes worldwide. Alpine Water: Naturally, water is a main ingredient of Red Bull.