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In addition to the whey protein, casein protein is also essential to the bodybuilder's supplement collection. Unlike whey protein which is digested by the body incredibly fast, this protein is digested very slowly because it has the ability to curdle in the stomach. This is desirable at times when a person will not be eating another meal for a couple of hours, and would like to keep a high amount of amino acids in the blood for a few hours. This is why it is sometimes referred to as a "Night-time" protein. It has the ability to keep the body in an anabolic state, and out of starvation mode.