Whey comes from cheese. We dry out the cheese and all that flows out is whey. IT's then dried, and hey presto! Served as whey. So basically, all forms of whey is just a byproduct of cheese.

Now don't come telling me, that Weider has a special formulation business where they produce the whey specially. It'd be a retarded waste of money, for them to build a facility and use super cool ultra good cow milk and then make cheese, sell to other cheese company and then they use the whey. You'll make a fool of yourself if you say that.

The purest whey, is the whey that has no flavor at all. It smells like milk, taste like water, is very easy to mix and tastes horrible. The protein density is another gimmick by supplement companies. Usually, they just give a bigger scoop and then say there's a lot of nutrients in there along with protein. Or, they give a smaller scoop, and not put a few additives (it's usually just a few grams) of nutrients and then say "High protein density!"

And how I dare say that? I know a guy that buys whey from cheese manufacturers (they use to pour it out and throw it) and packages them into these huge packs and sells to companies. He says it's the same everywhere. Whey is at it's highest BV of any known protein. If anybody says their protein shakes is better, he says to ask them, how? If they say it's higher protein content, smack them in the face for lying, because the only way you get higher protein content from whey is by increasing the size of the scoop.