HMB is a metabolite of the branch chain amino acid (BCAA) leucine. Pro-HMB is of the purest natural source and research has shown that HMB may assist in preventing catabolism (muscle breakdown), which can often occur when performing intense forms of exercise.

HMB has become the subject of an aggressively defended patent dispute in the United States. This serves to demonstrate how seriously the purveyors of this material view it''s worthiness. The subject of numerous medical trials, HMB has firmly established itself in the athletes