NICApur Vitamin D3 liquid 25 mlThe sunshine vitamin for the whole family For a long time, vitamin D was considered a pure bone vitamin. In recent years, however, it has been found that vitamin D influences and regulates many other functions in our body. Vitamin D supports our immune system, is important for muscle function, for the bones and for maintaining normal calcium levels in the blood. Vitamin D is a special vitamin because it is formed in the skin through direct sunlight.