Another advantage of combining protein with milk rather than water is a faster rate of muscle repair. Milk is made up of a combination of liquid whey and casein protein; this combination of whey and casein aids in muscle recovery after a strenuous workout. Yes, however adding milk powder will boost the whey's carbohydrate content. While utilizing this combination, keep in mind the quantity of protein you're consuming. That's all. The rate of absorption can be slowed by mixing milk powder. After a workout, I like to drink Myfitfuel whey protein with water to assist my muscles recuperate.