We already have whey for protein, but what happens if you turn up the quality? Filter it some more, get it to be as pure as you can, and poof! A whey protein isolate appears, with even MORE protein per serving than just a regular whey. On top of that, you don’t even have the stuff in whey you don’t want - sugars like lactose that give you a bad case of the runs!
This means you want to choose isolate whenever you need to get rid of gluten or lactose and, like whey, you can use it to build muscle or just give you shake extra punch with a delicious, smooth texture!