The Best Way to Gain Lean Muscle Quickly Beta-hydroxy beta-methylbutyrate (HMB) is an important metabolite of the essential branched chain amino acid (BCAA) L-Leucine. Human and animal studies suggest protein breakdown and support significant increases in muscle strength and size when combined with intense resistance training (1,2,3) Optimum Nutrition's HMB Capsules are produced and packaged in our own state-of-the-art, OTC approved manufacturing facility. Each capsule provides 1000 mg (1 g) of pure beta-hydroxy beta-methylbutyrate (HMB).
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