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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.
Whey protein powders can range from lean proteins to weight gainers. Make sure the main macronutrients of the powder fit in with the goals of your diet. In some cases additional complexes will be added to the protein powder for added benefit, such as creatine or glutamine.