Optimum 100% Whey Gold Standard contains Optimum Nutrition proprietary blend of Whey Protein Isolate, Whey Protein Concentrate and Hydrolyzed Whey Protein Isolate. Optimum Nutrition 100% Whey Gold Standard provides whey protein isolates (WPI) - the purest and most expensive source of whey protein available. It now also has a higher protein percentage. ON's 100% Whey Gold Standard has always been a leader in this respect. Now with 24 grams of protein in just slightly over one-ounce serving, it's nearly 79% protein by weight! ON 100% Whey Gold Standard is instantized to mix easily and completely with just a few twirls of a spoon. Over 4 grams of glutamine and glutamine precursors as well as 5 grams of BCAAs (leucine, isoleucine, and valine) in each scoop! 78% protein by weight (24g of protein per 30.4g serving size) 100% of the protein derived from whey Over 4g of glutamine & glutamic acid in each serving The "Gold Standard" for Protein Quality