NO3 is Nitrate, an advanced compound that delivers unbelievable muscle pumps and amplifies the effectiveness of every ingredient in C4 Extreme. Cellucor is utilizing a new compound where NO3 has been fused to Creatine to create Creatine Nitrate; according to a major university study, Creatine Nitrate is 1000% more water soluble than either Creatine Monohydrate or other creatine derivatives. Unmatched water solubility ensures better absorption and absolutely none of the traditional side effects of Creatine supplementation. You will have more energy than ever imagined possible from a supplement. You will get that extra rep, complete that last set - detonating any previous strength, endurance, and physique personal bests.