What is one of the main sources for Vitamin D, needed by the body to maintain strong bones and teeth?

Explanation

Vitamin D is inactively absorbed by the body through food or sun exposure. The vitamin aids the admittance of calcium and phosphate from the colon and in bones and teeth. In the winter, the population in some parts of the world, not least in the north, are at risk of not getting enough natural Vitamin D. Therefore, Vitamin D2 or Vitamin D3 is added to some food products, not least to milk, to make sure the population has its needs covered.