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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.
Whey concentrate powder is filtered further to remove some fats and lactose compounds and has a final protein percentage of 50 percent to 89 percent. Whey isolate, an even more processed form of powder, has the majority of lactose and fat removed and is at least 90 percent protein by weight.Hydrolyzed whey powder undergoes additional processing; it may sometimes be called predigested whey.ydrolyzed whey protein may be easier for people with allergies to digest. Photo Credit Comstock/Stockbyte/Getty Images. Whey protein powder is used in supplement drink mixes and meal replacements aimed at reducing body fat and increasing lean muscle mass.