Casein is a family of phosphoproteins which make up 80 percent of the proteins in cows' milk. When ingested, casein forms clots in the stomach making it very slow to digest. Because of this, it is most often recommended as a post-workout supplement. Similarly to whey, casein will encourage muscle repair after a workout. Experts say that a whey and casein protein shake is more effective post workout than either protein alone.
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