HMB increases the production of muscle proteins
What is HMB?
In the diet of every athlete, proteins are essential. Indeed, every effort in both endurance sports and power sports requires muscle strength, and proteins are the most important building blocks for that muscle. Proteins are composed of amino acids. Some of these amino acids, the essential amino acids, can not be created by the body themselves. Lack of protein in our diet leads to lacks of essential amino acids in our body.
Β-hydroxy-β-methylbutyrate (HMB) occurs naturally in the body as the active form of the essential amino acid leucine. Fish (eg catfish) and citrus fruits (eg pumpkin nut) are good sources of HMB in the diet. 
What type of athlete is HMB supplementation for?
- In untrained athletes, muscle damage is greater. HMB accelerates muscle repair in such situations. 
When can I take HMB best?
1 Wilson GJ et al. Nutrition & Metabolism 2008, 5:1.
2Gallagher PM et al. Med Sci Sports Exerc 2000, 32:2109-2115.
3Nissen S et al. J Appl Physiol 2003, 94:651-659.
4 Knitter AE et al. J Appl Physiol 2000, 89:1340-1344.
5 Vukovich MD et al. J of Strength and Condition Research 2001, 15(4):491-497.