However, the adverse effects due to high doses of vitamin D are very rare. Vitamin D is a vitamin that is dissolved in fat. Under the influence of sunlight, it is formed in your body and it is necessary for the development of your skeleton. Vitamin D gives shape to your body and emotions. Vitamin D is extremely important and the combination with calcium is worth gold! A lack of vitamin D can lead to unpleasant ailments and diseases. Therefore make sure that you get enough of it.