Whey Protein Isolate or WPI is a very fast-digesting dairy protein that has the highest protein intake per serving with almost no carbohydrates or fats. WPI is also 99% lactose-free, making it suitable for most people who are lactose intolerant.
The process of producing WPI involves filtering the whey to remove most of the fat, lactose, and other non-protein components, resulting in a product with a high protein content. This filtration process usually yields a product that is approximately 90% or more protein, making it one of the purest forms of whey protein available.