What is creatine monohydrate? Creatine monohydrate, also known as N-methyl guanidino acetic acid, inosine, forming acetic acid, and creatine sarcosine, is a pharmaceutical raw material and an additive for health care products. It can inhibit the generation of muscle fatigue factors, reduce fatigue and tension, restore physical fitness, accelerate protein synthesis in the human body, make muscles stronger, enhance muscle …