Vitamin D, a fat soluble vitamin, has the important role of maintaining blood levels of calcium, which it does by increasing absorption of calcium from food and reducing urinary calcium loss. This keeps calcium in your body and spares calcium stored in bones. So when required, vitamin D will transfer calcium from your bones into your bloodstream, which does not necessarily benefit your bones, but the overall effect of vitamin D on bones is more complicated than stated here. We do understand that vitamin D is necessary for healthy bones and teeth.
If you don’t have a subscript for vitamin D, then you’re most likely using one of two primary forms (D2 & D3) used as supplements.
Vitamin D Uses
Vitamin D increases calcium absorption and helps make bones stronger. Supplementation has been shown to reduce bone loss in women who have to supplement their food diet for lack of vitamin D. Also it had been shown to slow bone loss in people with osteoporosis and in postmenopausal women.
Vitamin D works with calcium to prevent some musculoskeletal causes of falls and subsequent injuries.
Vitamin D is required to maintain adequate insulin levels. Supplementing with Vitamin D may improve blood sugar control in those suffering from type 2 diabetes.
Vitamin D may help prevent upper respiratory tract infections in people who are deficient in the vitamin, but not necessarily those who maintain normal vitamin D status.
Vitamin A -- Vitamin B-Complex -- Vitamin C -- Vitamin E