Rockstar Zero Carb
B-vitamins. Taurine. Caffeine. Zero sugar. Zero carbs. 240 mg caffeine per can. Rockstar Energy Drink is designed for those who lead active lifestyles - from athletes to rock stars. Rockstarenergy.com. In Each Serving: taurine 1000 mg, caffeine 120 mg, glucuronolactone 50 mg, l-carnitine 25 mg. Total caffeine from all sources: 240 mg per can. 0 calories per can. Dispose of properly.