HMB (Calcium B-Hydroxy B-Methylbutyrate Monohydrate) is a potent metabolite of the Brach Chain Amino Acid (BCAA) Leucine and has been shown in scientific studies to promote muscle growth, protect muscle tissue & preserve muscle cells. Research has show HMB to increase maximal oxygen consumption (VO2 max) and improve the respiratory compensation point. It appears the HMB may reduce metabolic acidosis, and the research also shows that it helps athletes tolerate high-intensity activity over a long period of time. HMB has been show to lengthen the time to the onset of blood lactate accumulation )OBLA. HMB improves the training status for endurance athletes for positive effects on endurance performance.