Yes, it’s true our exposure to sunlight, given the right season and enough time in the sun, has an important role in determining our Vitamin D status. With the help of sunlight, vitamin D is synthesized by the body from a precursor derived from cholesterol. Vitamin D exists as either vitamin D2 (ergocalciferol) or vitamin D3 (cholecalciferol). The active from of vitamin D is actually a hormone that targets organs – most notably the intestines, kidneys, and bones. In the intestine, vitamin D is involved in the absorption of calcium and phosphorus. In the bone, it assists in the absorption of calcium and phosphorus, helping bones grow denser and stronger as they absorb and deposit these minerals.