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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.
Meal replacement powders (MRP) are larger serving sizes of a protein powder that provide 250-300 calories. They contain a blend of whey and milk proteins and have added carbs, fiber and vitamins. Many people use a half serving, which provides about 20g of protein and 10g of carbs. Egg, soy or plant proteins.