While there are distinct differences between WPCs and WPIs, there are also differences between different WPI products, and some whey protein isolate products are purer than others. With Ultra Iso Whey we don´t add any gums, binders, fillers, and thickeners to weigh the shake down or interfere with the absorption of the protein. We also don´t use any aspartame. And because we use only ultrafiltrated whey isolates, Ultra Iso Whey preserves many of the important biological fractions found in whey including immunoglobulins, lactoferrin, GMP, and BSA. With our Ultra Iso Whey, you get a full spectrum whey isolate protein shake that mixes easily with a spoon and goes down easy. Best of all, Ultra Iso Whey is so clean, you can actually taste the difference.