Natures Aid Vegan Vitamin D3 is produced from lichen, so is suitable for vegetarians and vegans. Vitamin D3 contributes to the maintenance of normal bones, teeth and 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. It also helps to maintain normal blood calcium levels as well as reduce the risk of falling associated with postural instability and muscle weakness. Falling is a risk factor for bone fractures among men and women aged 60 years and over.