Ph D Fitness Overview The Ph D HMB is a very advanced supplement that often gets overlooked. It has a great effect on fighting muscle breakdown & fight in helping to repair the muscle. Hm B itself is a component of Leucine which recently has been widely investigated with results coming back positive for the user. Hm B is a very clever supplement that should be used in any bodybuilders daily regime. Beta-hydroxy beta-methyl butyrate (HMB) is a metabolite of the amino acid Leucine & is synthesized in the human body. It plays a part in protein synthesis & was discovered by Dr. Steve Nissen in scientific studies to purportedly increase muscle mass & decrease muscle breakdown. Highlights- Athletes seeking lean muscle mass- All athletes looking for increased recovery time- Strength & endurance athletes looking to offset muscle damage.- People who may be injured & cannot workout, which will assist in keeping muscle mass.