Whey is derived from the cheesemaking process. Once the milk passes quality tests, enzymes are added to separate the curd from the liquid whey. The liquid whey is then pasteurized and the protein is concentrated and isolated. The two main methods to achieve this are membrane filtration and ion exchange technology.
How do you make your own proteins?
You can whip that up at home, too—and it's cheap. Teaspoon of Spice mixes nonfat dry milk with bulk bin staples like rolled oats (ground in a blender or food processor) and almond meal, which act as natural thickeners. The result is a simple, satisfying protein powder that serves up 10 g of protein per serving.24 Feb 2017