Whey Protein Isolate is a form of Whey Protein with a slightly higher Protein content and is marginally lower in carbohydrates, lactose and fat than Whey Concentrate. Due to the extra processing of Whey Protein Isolate the bioactive compounds and growth factors can be degraded and lose their biological activity. Whey Protein Isolate is absorbed very quickly and will also elicit more of an insulin response due to the faster absorption.