Creatine is an amino acid found primarily in muscle tissue. It is phosphorylated to store energy used for muscular contraction. AST Sports Science Micronized Creatine Monohydrate has been shown in scientific studies to support increases in muscle fiber size, lean muscle mass and strength. This scientifically proven creatine delivers you an advanced "micro-particle" formula designed to go into solution rapidly and remain suspended in solution longer. This advanced formula delivers a fast acting, rapidlu absorbing, ultra-effective creatine without the stomach upset of gritty creatine residue. AST Sports Science Micronized Creatine is the only creatine supplement scientifically proven to directly impact muscle fiber size. It's time to put the power of science and the power of AST to work for you.