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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.
Photo Credit Paul Kane/Getty Images News/Getty Images. Protein powders are derived from various sources, such as milk, soybeans and eggs. The purpose of these supplements is to provide you with a concentrated protein source for maximum absorption and utilization by your body.