Healthy 'n Fit, Muscular Weight Gain 2, 2.5 LbProduct Description Muscle mass, two of the most basic and important things you need are a sufficient amount of protein and a surplus of calories. The ladder is especially true for individuals who tend to have a fast metabolism or difficult time getting enough calories solely from the foods they eat. All calories are not created equal though, only calories from high protein can be used by the body to build muscle. About 50% of the calories in muscular