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If you’ve ever stepped foot into a gym or browsed fitness supplements online, chances are you’ve come across whey protein. But what exactly is it? And why is it such a staple in the world of fitness, health, and nutrition? In this post, we’ll break down everything you need to know about whey protein — what it is, how it's made, its benefits, and how to use it effectively. What is Whey Protein? Whey protein is a high-quality protein naturally found in milk. In fact, milk contains two main types of protein: casein (80%) and whey (20%). When milk is processed to make cheese, the liquid that separates from the curds is called whey. This byproduct is then filtered, purified, and dried to create the whey protein powder you see on store shelves.