Since whey protein is so important both for body builders and weight lifters on the one hand and weight losers on the other, it is good to know about the sources of it. Cow’s milk is generally well known as the primary source for whey protein. Consumption of milk directly would not let you have enough whey protein since milk contains only 1% whey protein in it. That’s why people buy whey protein powder that is made of whey protein concentrate or isolate. Besides cow’s milk whey protein can be found in goat’s milk and different kinds of cheese. Goat’s milk is an excellent source for whey protein because it does not contain the same kind of casein protein found in cow’s milk that is difficult to digest and produces an allergic reaction to the body. Eating cheese for protein is not a good idea since it contains a lot of fat and cholesterol.