Nar Labs CASEIN is a cutting edge, slow-digesting protein formula consisting of 100% pure Micellar Casein protein. It is loaded with 48 grams of time-release casein protein designed to support lean body mass, promote strength, muscle growth and fast recovery. Rapid whey protein is needed immediately before and after exercise to aid in muscle recovery. Casein on the other hand is a slow-digesting protein source that supplies a time-release and sustained flow of amino acids into your bloodstream. This allows for a much more consistent flow of nourishment to your hardworking muscles to help repair and rebuild them while you sleep.