Vitamin D contributes to: The maintenance of normal bones and teeth and muscle function The normal function of the immune system The absorption/utilisation of Calcium and Phosphorus The normal blood calcium levels Vitamin D also has a role in the process of cell division New government commissioned report advises that everyone over the age of one should have a daily intake of 10ug of Vitamin D per day to protect muscle and bone health. Vitamin D contributes to: The maintenance of normal bones and teeth and muscle function The normal function of the immune system The absorption/utilisation of Calcium and Phosphorus The normal blood calcium levels Vitamin D also has a role in the process of cell division New government commissioned report advises that everyone over the age of one should have a daily intake of 10ug of Vitamin D per day to protect muscle and bone health.