B-hydroxy B Methylbutyrate (HBM)
B Hydroxy B methylbutyrate (HMB) is a metabolite of the amino acid leucine. When leucine is metabolized, it is converted into α-ketoisocaproate (KIC), which is further converted into HMB. Roughly 5% of leucine is converted into HMB. HMB became popular in the 1990s when Ross Pharmaceuticals developed a product known as Juven. Juven, which is a combination of HMB, arginine, and glutamine, was developed to help prevent losses in lean body mass in cancer and AIDS patients.
Source: natural identic lab made