Strong, tight, toned muscle is comprised with the obvious exception of H2O, primarily of protein. There is little question as to why protein has once again come to the forefront with anyone who is looking to enhance their muscularity. High Quality Protein is an integral part of the diets of athletes and body builders. CytoSport 100% Whey Protein offers the high quality whey protein without the aadded fat, sugars or carbohydrates. This formula makes it the perfect product to help pack muscle building protein into your diet.