United States Centers for Disease Control and Prevention (CDC)
Pro to the question "Is Drinking Milk Healthy for Humans?"
"Calcium is a mineral needed by the body for healthy bones, teeth, and proper function of the heart, muscles, and nerves. The body cannot produce calcium; therefore, it must be absorbed through food. Good sources of calcium include dairy products such as low fat or nonfat milk, cheese, and yogurt."
"Bone Health," available on the agency's website (accessed Apr. 5, 2007)