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Cellucor C4 Extreme Energy is a high energy pre-workout formula with an Extreme Energy Blend consisting of 300mg Caffeine, TeaCrine, Creatine Nitrate (NO3-T), and CarnoSyn Beta-Alanine. C4 Extreme Energy is the next step for those who want that extra rush. This pre-workout formula features twice as much caffeine, more focus and more endurance than C4 Original. C4 Extreme Energy isn't for the casual gym goer. It's for those of you who want to explode through their PRs over and over and over again. We know that some times, just a little bit of energy isn't enough. Cellucor C4 Extreme Energy is here to help you get up and go, rising to any challenge.