Researchers at Purdue University have found that the calcium that exists in milk is more beneficial for bones than the calcium carbonate that’s in supplements such as vitamin tablets or fortified foods. Their study, which was funded by the National Dairy Council in the U.S., compared the bones of rats fed milk or calcium carbonate. It revealed that the rats who took milk had longer, wider, stronger and more dense bones that the other group. They say that drinking milk is especially important during childhood, when bones are forming and growing, and that those benefits carry on into adulthood. They suspect milk helps the bones retain calcium better than supplements.