HMB is a critical metabolite of the essential amino acid, L-leucine, and a key component of branched chain amino acids (BCAA's). HMB supports significant increases in muscle strength and body composition (lean body mass) when combined with resistance training. HMB promotes muscle growth while providing support against protein breakdown. Building and maintaining muscle is difficult at best, but with the help of HMB your goal is that much closer. Increase strength in less time, assist muscle recovery and support increased endurance.