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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.
The soy protein powder can be used to make a protein shake or to add protein to other meals. Although soy protein isolate is naturally high in protein but very low in carbohydrates, many manufacturers add additional nutrients to commercial soy protein to improve its taste, texture, and nutritional value.