Energy Supplement. With other natural flavors. Caffeine. B-vitamins. Taurine. Ginseng. Milk thistle. Only 10 calories per serving. Electrolytes. In Each Serving: Taurine 1000 mg, caffeine 120 mg, panax ginseng root extract 50 mg, milk thistle extract 20 mg. Contains no juice. www.rockstarenergy.com. American made.