Unprocessed whey is a cheese production by-product. After curdling and straining the milk for cheese production, the watery part of the milk separates from the fatty parts and that’s where the whey is found. Whey is also one of the most commonly used types of protein used in protein powders. Whey helps in promoting muscle growth, reducing exercise-related injury, and improving athletic performance.  Image of cheese production by dyhuettner from Pixabay