Not only is the sun good for your soul, it also is a necessity for our bodies. About 90% of Americans are insufficient of Vitamin D. This doesn't mean to go and lay in the sun for ten hours. Between 15-20min in the sun is enough time to get a healthy dose of Vitamin D. We also can get Vitamin D via foods but it is much harder. Sources through the diet include fatty fish, cream, milk, fortified butter and cod liver oil. Sunlight & supplements are humans top sources. There is such a large diffency because of excess sunscreen use, obesity rates, employment practices, season & location.
Vitamin D is a fat soluable vitamin that is a hormone like substance. It is produced by the skin(an organ) that travels to target end organs. The Vitamin reduces blood pressure, helps calcium absorption & plays a role in maintaing glucose.