Vitamin D is necessary to help support the growth, development and maintenance of bones and teeth in both adults and children. It is also required for calcium and phosphorus absorption and utilization.
Vitamin D works with calcium to control bone formation and is unique in that it is obtained not only by eating foods that contain vitamin D, but also formed spontaneously in the skin, caused by the sun. Foods that contain vitamin D include oily fish, egg yolk, live yoghurt.
Cod Liver Oil is a good source of both Vitamin D and A.