Vitamin D is essential for the body to absorb calcium, as well as for maintaining healthy teeth and bones. It is also needed for the proper function of the immune system. The best way to get Vitamin D is by exposing your skin to sunlight. However, some people may be unable to do this, and if you are one of them, you should consider using a vitamin D supplement. This is where Vitamin D granules come in. These granules are a convenient and easy way to get Vitamin D into your body.