Natural flavors. What you need: Explosive energy, heightened alertness, enhanced thermogenesis, minimal carbs & calories. What it's got: 5 Calories, 250 mg of caffeine, 760 mg proprietary methxanth stack, theobromine, yerba mate, guarana, & DMAE, no sugar. The force in the gym since 1985. Total caffeine from all sources is 250 mg. Total synephrine from bitter orange is 25 mg. Made in the USA.