What Is Vitamin D?
Vitamin D is essential for maintaining strong bones and teeth, keeping your immune system healthy and facilitating the absorption of calcium and phosphorus (1). Because vitamin D is not found naturally in very many foods, most health professionals recommend getting at least 5–30 minutes of sun exposure daily or taking a supplement to meet the recommended daily amount of 600 IU (15 mcg) (2).
However, those living too far from the equator may not be able to meet their requirements through sun exposure alone. At certain latitudes, very little vitamin D can be produced by the skin for up to six months of the year (3). Read more