Beta-Hydroxy Beta-Methylbutyrate, commonly known as HMB, is a compound that the body produces from the amino acid leucine. It is often used as a dietary supplement to support muscle growth, strength, and recovery, particularly in individuals engaged in intense physical training. Research suggests that HMB may help reduce muscle breakdown and promote muscle repair, making it popular among athletes and bodybuilders. It is also studied for its potential benefits in preventing muscle loss in older adults and those undergoing certain medical treatments.