Although whey protein is produced out of milk, TesteroneXLthere is only a certain amount of milk a human can intake. Drinking milk is a healthy and good option but it would take an extremely long process in gaining the amount of protein that is needed to build muscles up fast and safely. Milk does not alone provide up with the good nutrients like protein and calcium. It also provides us with fat, lactose and carbohydrates which is not the best intake while working out. How about semi skimmed milk? This still has a concentrate in it but a limited amount. If you are serious about a good muscle building program, then finding the right protein is the better option. This will eliminate the intake of fat and cholesterol. From whey protein you will be gaining pure protein that your body needs.