Muscle Protect™ with HMB® provides a great-tasting, leucine-rich blend of essential amino acids combined with HMB®, vitamin D3, and glutamine for muscle maintenance. Leucine, a branched-chain amino acid, has an anabolic role in muscle protein synthesis and may specifically benefit aging adults by preserving healthy muscle mass and function. β-Hydroxy-β-methylbutyrate (HMB) is a metabolite of leucine that supports lean muscle mass through two unique mechanisms: decreased muscle degradation and increased protein synthesis. Vitamin D and glutamine provide additional support for muscle health.*