Whey protein is derived from milk, which actually contains two proteins. Casein makes up approximately 80 percent of milk protein, and whey makes up the other 20 percent. When milk is turned into cheese, whey is separated from the solid curds and can be found in the liquid that is left behind.
Once separated, the whey goes through several more processing steps to become what most people recognize as "whey protein." In this final form, whey protein is a relatively tasteless powder that can be added to shakes, protein bars, or even baked goods. It's a common protein-boosting ingredient in commercial smoothies, bars, cereals, and plenty of other foods, but can also be taken on its own.
Like all proteins, whey is composed of amino acids, which the body can use for muscle growth and tissue repair. But whey's high concentration of branched-chain amino acids, especially leucine, set this protein apart from the others.
Whey is by far the most popular protein supplement because it has...
Source: What Is Whey Protein Made Of?
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