http://www.7naturallaws.com/Whey-Protein-Powder : Whey protein isolate is made in one of the most refined processes for any health food. If you were to look for this supplement, the healthiest form of whey protein, you should look for ones that are made purely. Some forms of whey protein are highly concentrated that there is a lot of filler and other junk that doesn't bode well for your body. This is commonly referred to as whey protein concentrate.