When most people think of Cytosport products, Muscle Milk -- the answer to hard-gainer's prayers and anyone looking to pack on mass -- is usually what comes to mind. Cytosport is a multifaceted sports supplement company producing products for bodybuilders as well as endurance sports, like tri-athletes and marathoners. Now they offer Muscle Milk products in bars, oatmeal mixes, and ready-to-drinks.