What is Vitamin D? Naturally produced by sun exposure, Vitamin D plays a vital role in supporting our overall wellness.* From promoting calcium absorption to being a key factor in supporting the health of our bones, Vitamin D is an essential part of any routine.* As we age, our ability to use the sun's UV rays to naturally create Vitamin D decreases and drops. This, in addition to spending more time indoors, has led to more and more people experiencing deficiency in this essential vitamin.