HMB (beta-hydroxy-beta-methylbutyrate) is a bioactive nutrient belonging to the group of branched short-chain fatty acids, considered by some sources as a vitamin-like factor (similar to vitamins in terms of its effects), found naturally – in small quantities – in food, as well as produced by the human body as a result of the conversion of the branched-chain amino acid – leucine.

• activation of kinases – enzymes which act as a second messenger of information during the protein synthesis process
• interaction with kinases during the activation of initiation complexes which trigger the elongation phase of protein synthesis
• inactivation of catabolic enzymes which destroy muscle proteins