Muscle Milk is a blend of casein and whey, I think. Some kind of whey isolate would probably be best post workout. But the casein wouldn't be bad because it would have a time release effect..your body would still be craving nutrients much more even a few hours after a workout compared to before your workout. I think Muscle Milk would be a pretty good post workout shake. But........there are only 15 servings per container which makes it expensive. Do you think there is enough whey protein per serving to make it a good post workout shake?