Natures Aid? Vitamin D3 contributes to: The maintenance of normal bones, teeth, muscle function Vitamin D plays a role in the process of cell division and is helpful in the normal absorption and utilisation of calcium and phosphorus. Vitamin D helps to maintain normal blood calcium levels. Vitamin D helps to reduce the risk of falling associated with postural instability and muscle weakness. Falling is a risk factor for bone fractures among men and women 60 years of age and older.