Optimum Nutrition Gold Standard 100% Whey Protein, Coffee, 5 LBOptimum Nutrition Gold Standard 100% Whey Protein, Coffee, 5 LB, is formulated with whey protein isolate, a highly pure protein source. This product is designed to support muscle building and recovery. It contains essential amino acids, including the three branchedchain amino acids (BCAAs): leucine, isoleucine, and valine, which are crucial for muscle protein synthesis and are not produced by the body. Key features include: Primary source of protein: