Doctors use the 25-hydroxy vitamin D test to monitor your vitamin D levels. Low levels can mean you need to spend more time outdoors or adjust your diet. But it can also occur with certain medical ...

Some research shows that low vitamin D levels may affect joint pain related to some types of arthritis. However, the evidence is mixed, and more research is necessary to understand whether ...

Everyone knows vitamin D-- it's the nutrient we get from the sun. Vitamin D is important for several bodily functions, the main ones being bone and muscle strength and immune function. Still, about 35 ...

For adults, a level of vitamin D in the blood of 20 nanograms per milliliter (ng/mL) or above is generally considered adequate. Levels below 20 ng/mL are generally too low for adequate bone health and ...

If the winter weather has you spending less time outside in the sun's rays, these foods can give you the vitamin D you need. Arielle Burton was an associate content manager on CNET's Performance ...

For a while vitamin D was looking like a bona fide health elixir. It was recognized a century ago as the cure for rickets, a childhood disease that causes weak and deformed bones. Then, in the early ...