Whey Protein

Whey is a derivative of milk, is the liquid that is left behind after the first stages of the cheese-making process. If you have ever curdled milk, you have witnessed a botched version of cheese production; the whey is the liquid component that separates from the solid particles. ("Curds and whey" is, essentially, cottage cheese.) High in protein and found in dairy products, protein shakes and bars and countless processed foods. 

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