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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.
Protein Powdersâ Hidden Problems. A very overlooked problem with protein powders is too much of the essential amino acids: valine, leucine, and isoleucine. These BCAAs are great when provided in real food, and in the right amounts. In excess, however, they are used for energy utilization.