Supports muscle mass in ageing individuals by reducing protein breakdown in the muscles | Ideal for 50+ Muscle mass peaks around 30 years of age, and naturally declines on average 1% per year. This accelerates in our 70s on average 15% per decade. That’s why Bioglan created Muscle Protect HMB + D3. Backed by science, HMB supports muscle health as you age by maintaining your muscle mass and muscle protein stores. Vitamin D increases the metabolism of calcium in your bones, so you stay stronger for longer.