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 ...

Vitamin D toxicity can happen if you take too many vitamin D supplements. Even high levels that do not cause toxicity can be harmful. Share on Pinterest Sophia Hsin/Stocksy United Vitamin D toxicity ...

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 ...