Whey Isolate

Whey Isolates are the purest form of protein and being the most expensive form.
Most Isolates formula have lower calories per serving, lower fats, carbohydrates & sugar which is good for those who are on diet or competing as those few grams lesser may give you better results in your physique. Some even have 0g of fats, carbs & sugar such as MusclePharm Combat 100% Isolate.
For a more inexpensive choices, please check out whey protein or whey sustain release instead.