Protein Nutrition Shake. Contains No Milk. Includes Milk Proteins. Gluten Free. Why do you workout? Is your season on the line? You have a big race coming up? You want to push you mind and body to test the outer limits of human determination? Or are you just trying to squeeze a little more cardio into your work week? It doesn't matter. We all need strength. Drink a Muscle Milk RTD after your workout or any type of training to help you build the strength you need and want. MUSCLE MILK® products can be used pre-workout, post-workout or a protein-rich snack.