Medically reviewed by Soma Mandal, MD A vitamin D test is a blood test that measures the level of vitamin D (calciferol) in ...

Vitamin D affects how your immune system works, and plays a role in controlling certain types of inflammation, including the ...

Vitamin D is essential for our bodies, helping us absorb key minerals like calcium and magnesium that keep our bones and muscles healthy. We naturally get some vitamin D from sunlight, but in many ...