25g Premium sustained-release protein. 5g BCAAs from protein. Good source of fiber. Met-Rx 100% Micellar Casein protein is a premier sustained-release formula that can be used any time of the day - morning or night. Each protein-packed serving provides a sustained delivery of amino acids to fuel lean muscle, strength and recovery. When casein proteins are ingested, they dissolve very slowly from the stomach before eventually reaching the bloodstream. This creates a "time-released" effect that allows amino acids to steadily make their way to the muscles over an extended period. MET-Rx's protein provides casein only as Micellar Casein. Casein also provides all of the essential amino acids needed for lean muscle, including the branched chain amino acids Leucine (2.3g), Isoleucine (1.1g) and Valine (1.4g). Each scoop is further enhanced with a good source of fiber (3g). Whether you are trying to get lean or gain mass, daily fiber intake is important for digestive support and maintaining your overall physique.