Vitabiotics Ultra Vitamin D tablets contributes to the maintenance of normal bones and teeth and is also known for its role in supporting normal function of the immune system, normal cell division and normal muscle function. Ultra Vitamin D provides 1000 IU vitamin D3. Safeguarding the diet with vitamin D is recommended to help maintain optimum level throughout the year, especially the winter months. This is particularly important for those who have restricted or limited exposure to the sun. Many national governments now recommend vitamin D supplementation for the entire population, due to the many benefits of this key nutrient.