Optimum Nutrition, Gold Standard 100% Whey, Chocolate Peanut Butter 2 lbsProduct Description Whey Protein Isolates (WPIs) are the purest form of whey protein that currently exists. The first ingredient you read on the Gold Standard 100% Whey label. By using WPI as the primary ingredient along with premium ultra filtered whey protein concentrate, we're able to pack 24 grams of muscle building protein into every serving. ON's attention to detail also extends to mixability. This superior quality powder has been instantized to