Whey protein isolate is a purer form of whey protein than whey protein concentrate due to additional processing that involves either longer filtration times or additional steps in the manufacturing process, such as cross-flow microfiltration or ion-exchange chromatography. The further processing can create a whey protein powder with a protein concentration higher than 95%. Due to the lower carb and fat content, it's a great whey protein to use when dieting and is also great around workouts because it is digested and absorbed quickly to help build muscle.