Did you know that between the ages of 40 to 70 years, adults lose on average 24% of their muscle mass? This loss of muscle mass can affect our strengtn and vitaity Ensure NutriVigor - Nutritional Supplement. Scientifically designed to help support muscle strength NutriVigor is a unique system of ingredients including Acti-HMB, protein and vitamin D to help rebuild muscle and strength naturally lost over time.