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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.
Varieties of protein powders. Protein powders can be made from different ingredients; the most common are whey, casein, soy, pea, rice and hemp. Each variety carries its own pros and cons. For instance, whey is a complete protein that is easily digested and absorbed into the bloodstream.