It seems like of all the vitamins, D is probably one of the most important for overall health and one most people are deficient in.
Mankind was not made to live indoors all the time.
God created Adam and Eve and put them in a garden.
Its really a pro-hormone. please remember, that depending on where you live, plus time of year, you will not be able to get from being outdoors.
Best course of action is to have your blood levels checked, and supplement when necessary. Yes,it is extremely important to maintaining good health.
Without sunscreen!.................