Whey protein isolates are the purest and most expensive form of whey protein that exists thats why they are the first ingredients you read on the gold standard 100 whey label by using whey protein isolates as the primary protein source optimum nutrition are able to pack 24 grams of the purest muscle building protein per serving with a lot less of the fat cholesterol lactose and other stuff that you can do without whey protein isolates are the purest and most expensive form of whey pro