USN Casein Night Time Protein is a gradual-release micellar casein with added Aminogen® for optimal protein digestibility and absorption. The slow digestion and absorption of amino acids has become an essential and highly beneficial element of recovery. Taken primarily before bed, or prior to periods where your body typically is subjected to reduced food intake, casein has shown to help spare and protect lean mass. Selecting the highest grade of micellar casein, USN has set a new standard in slow-absorption protein supplementation. Product Functionality Protein is necessary for tissue building and repair. Protein contributes to the maintenance of muscle mass. Calcium and potassium are necessary for normal nerve and muscle function, and is needed for muscular growth and contraction. Magnesium contributes to normal protein synthesis.