What it is: HMB (B-hydroxy B-methylbutyrate monohydrate) is the metabolite of the amino acid leucine, and has been shown to suppress exercise-induced muscle tissue breakdown. Supplementing with HMB may: Minimize protein breakdown and damage to muscle cells Help the body maintain an anabolic state Improve body composition Supplement Facts Serving size 4 capsules Amount Per Serving General Nutrition Potassium 200 mg Calcium 200 mg Micronutrients Calcium B-Hydroxy B-Methylbutyrate Monohydrate (HMB) 1 g