Optimum Nutrition Gold Standard 100% Whey Protein, Double Rich Chocolate, 5 LB

Optimum Nutrition Gold Standard 100% Whey is made of whey isolate, which is one of the purest types of protein and is the first source of protein for building muscle. It contains essential amino acids that are not manufactured by the body, including the three BCAAs (leucine, isoleucine and valine).