Reflex Nutrition HMB 500mg - 90 Caps

HMB, or Calcium Beta-Hydroxy Beta-Methylbutyrate, is a metabolite of the branched-chain amino acid leucine.

Branched-chain amino acids, also know as BCAAs, consist of L-leucine, L-isoleucine and L-valine, these are three of the nine essential amino acids. About 35% of muscle protein is comprised of BCAAs, so it is important to have enough available in your body when you are trying to gain and/or maintain muscle.