PurePro HMB Powder contains 3000 mg of Calcium beta-hydroxy-beta-methylbutyrate (HMB) per serving, which has been used by professional and hobby athletes alike for decades, thanks to its pronounced anti-catabolic nature. Amongst other things, HMB contributes to the acceleration of regeneration as well as boosting and maintaining muscle mass and has a positive effect on the muscle-fat ratio of the body.