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 mix easily using a shaker cup or just a glass and spoon. There’s no doubt that this is the standard by which all other whey proteins are measured.