“Vitamin D deficiency is very common and ongoing research ... showed 14% lower circulating concentrations of vitamin D (25-hydroxyvitamin D, a form of vitamin D) than those not diagnosed with ...

Despite the importance of vitamin D for overall health, it is estimated that about one billion people worldwide have a deficiency, usually defined as having serum levels of 25-hydroxyvitamin D 3 ...

According to the International Osteoporosis Foundation, osteoporosis is the most common bone disease. It affects one in five ...

The vitamin D test usually measures the level of 25(OH)D in your blood ... test if you have a higher risk of developing ...