Casein protein powder is a good source of protein that offers unique benefits over other sources. No other protein source offers the unique method of slow amino acid delivery that casein protein can provide. This makes casein protein powder an excellent protein supplement for use while you sleep to minimize muscle cell depletion while you sleep.
However, casein protein powder is usually high in lactose. This may present digestive problems for people that suffer from lactose intolerance. If you are lactose intolerant you should consider egg protein powder as an alternative "before bed" protein supplement.