What does Casein Protein Powder do?
Casein protein powder is unique in that its not digested quickly, but rather very slowly. Its peptide and micelle structure are disturbed by the acid in your stomach and this causes the casein to form a gelatinous structure which slows the digestion process. This means that rather than flooding your body with essential amino acids, it forms a steady flow of amino acids over up to 7 hours. While with a workout we are looking for a flood of amino acid directly after a workout, casein is useful for an entirely different purpose.
Casein is used for its anti-catabolic effect while you sleep. Use of casein before sleep maintains muscle mass and reduces muscle breakdown during your sleep.