Red Bull Sugarfree Energy Drinks (4 pack) special formula contains ingredients of high quality: Caffeine, Taurine, B-Group Vitamins, Aspartame & Acesulfame K, Alpine water. One 250ml can of Red Bull Sugar free contains 80mg of caffeine, about the same amount as in a cup of home-brewed coffee. Red Bull Energy Drink cans are made of 100% recyclable aluminum.