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Protein powder is a dietary supplement that is made from one or more of four basic sources of protein: whey, eggs, soy and rice. These concentrated sources of protein are processed into powdered form, which can be reconstituted into liquid form as a protein shake when mixed with water, fruit juice or milk.
Here are a few of our favorite ways to use protein powder: 1  Protein powder makes an excellent addition to smoothies, as it helps balance out the natural fruit sugars and carbohydrates with some satiating protein. 2  Protein powder is also a great way to add some plant-based protein to vegan balls, bites and bars.