Low vitamin D levels may be linked to joint pain, especially with chronic or severe deficiency. Evidence is mixed, so more research is necessary. Studies suggest vitamin D supplementation may improve ...

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 ...

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 ...