Most adults need at least 600 IU of vitamin D every day to maintain healthy levels. Blood levels of vitamin D below 12 ng/mL are considered deficient and can be harmful to health. Vitamin D helps the ...

Vitamins D and C both play important roles in immune health, but will either prevent you from getting sick? Here's what experts want you to know.

Vitamin D tests involve taking a blood sample to measure the vitamin D levels in your bloodstream. There are two forms of vitamin D in the blood: 25-hydroxy vitamin D, or calcidiol, and 1,25-dihydroxy ...

New research indicates that for patients with advanced skin cancer, it may be important to maintain normal vitamin D levels when receiving immunotherapy medications called immune checkpoint inhibitors ...