B-vitamins. Taurine. Caffeine. Zero Sugar. Zero Carbs. Low calorie. In Each Serving: Taurine 1000 mg, Guarana Seed Extract 100 mg, Caffeine 80 mg, Glucuronolactone 50 mg, L-carnitine 25 mg, Inositol 25 mg. Total Caffeine from All Sources: 160 mg per can. www.rockstarenergy.com.