It has long been known that vitamin D is essential for strong bones and teeth however recent research suggests that it plays a much wider role in keeping us healthy. Deficiencies in vitamin D have been shown in large parts of our population and this is not good news as it can lead to weak bones and in extreme cases the disease known as rickets or osteomalacia. There is much misinformation about vitamin D, and it is important to know the different types when taking supplements. So what do the recognised experts recommend?