When our organic cheese makers start making their cheese, the milk is first separated into whey and curds. The curds then go on to be turned into cheddar, leaving behind the whey which then goes through a simple two-stage process, resulting in a high quality whey protein powder.
It's as simple as that; nothing is added and the only parts of the whey that are removed are lactose and water, thereby retaining the numerous beneficial properties of the whey.