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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.
An assortment of protein powder scoops on a wooden table. Most women get enough protein without turning to supplements, but a credible body of scientific research does support benefits of supplementing with protein powder.