Optimum Nutrition'S Gold Standard 100% Whey is using pure Whey Protein Isolates as the primary ingredient. Combined with ultra-filtered whey protein concentrate, each serving provides 24 grams of all-whey protein and 5.5 grams of naturally occurring Branched Chain Amino Acids [BCAAs] which are prized by athletes for their muscle building qualities. With more than 20 tempting flavors to choose from, On Gold Standard 100% Whey gives you plenty of ways to keep workout recovery interesting.