HMB (beta-hydroxy-beta-methyl butyrate)&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. This item cannot be exchanged or returned