Peak your performance with these coupons for Muscle Milk. Muscle Milk provides ready-to-drink and powder-form protein, protein bars and energy chews, all packed with the protein you need to stay energized. Build muscle and gain strength with Muscle Milk Nutrition Shakes and Bars that pack in up to 34 grams of protein with 20 essential vitamins and minerals. Choose from flavors like Cake Batter, Chocolate and Cookies 'N Creme.