Casein Protein

Casein is a protein found in milk, just like whey. But casein is absorbed and processed much more slowly. When casein and stomach acid mix, a gel is created that slows stomach emptying and delays the absorption of amino acids into the bloodstream.

Your muscles are exposed to amino acids more gradually and steadily as a consequence, which slows the rate of protein breakdown in your muscles. According to research, casein is less efficient than whey protein at boosting MPS and strength than soy and wheat protein. However, one research on overweight men shows that casein may beat whey in terms of improving body composition during strength exercise when calories are restricted.