Whey Protein Isolate. Primary Source. 100% of the Protein from Whey. Gluten Free. Banned Substance Tested. The True Strength of Whey: Whey Protein Isolates (WPIs) are the purest form of whey protein that currently exists. WPIs are costly to use but rate among the best proteins that money can buy. That’s why they’re 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 (WPC), we’re able to pack 24 grams of protein into every serving to support your muscle building needs after training. 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. Beyond the Basics: 77% Protein by Weight (24g of Protein per 31g Serving Size). Whey Protein Isolate (WPI) Main Ingredient. Whey Protein Microfractions from Whey Protein Isolate and Ultra-Filtered Whey Protein Concentrate. Over 4 Grams of Naturally Occurring Branched Chain Amino Acids (BCAAs) Leucine, Isoleucine, and Valine in Each Serving. The “Gold Standard” for Protein Quality.