Vitamin D promotes calcium absorption in the gut and maintains adequate serum calcium and phosphate concentrations to enable normal bone mineralization, without sufficient vitamin D, bones can become thin, brittle, or misshapen.
Vitamin D has other roles in the body, including reduction of inflammation as well as modulation of such processes as cell growth, neuromuscular and immune function, and glucose metabolism.
Testing for Vitamin D has become a must among adults due to the influence of this hormone in the regulation of so many functions in the body.