HMB stands for
β-hydroxy-β-methylbutyrate, a byproduct (metabolite) of the breakdown
of the amino acid leucine. HMB is produced naturally by the body and
can also be gotten through dietary measures, however the amount
necessary for an improved body exceeds the amount a reasonable person
would get through diet alone. Because of this, the HMB supplement is
popular among body builders and those trying to gain lean muscle and
cut down on body fat. HMB has been shown to be effective at increasing
lean muscle while decreasing muscle deterioration. Other benefits
include lowered body fat and cholesterol and enhanced muscle repair
after exercise.