Energy Supplement. Caffeine. Green tea. Yerba mate. B-Vitamins. Taurine. Zero sugar. Double strength. Double size. The world's most powerful energy drink just got more powerful. We've stepped up the energy with 50% more caffeine and cut the carbs and calories to keep those with active lifestyles lean and fully charged. (These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease). American made. Bigger. Faster. Stronger. Zero sugar. The 16 oz zero carbs.