There are two primary forms of vitamin D—D2 (ergocalciferol) and D3 (cholecalciferol). A vitamin D test, specifically the 25-hydroxyvitamin D blood test, is used to diagnose deficiency.

Vitamin D2 and D3 are types of vitamin D that help maintain or raise vitamin D levels in the blood and treat deficiencies. They have slightly different chemical structures and come from different ...

Vitamin D supplements are popular for bone health and immunity. When is the best time to take vitamin D? Here's how to take ...

There are two types of vitamin D supplements available for over-the-counter purchase (vitamin D2 and vitamin D3). Vitamin D3 is the type that most experts believe should be utilized in clinical ...

You probably already know that vitamin D helps build and maintain strong bones. You may even know that it's produced in your body when the sun’s ultraviolet B (UVB) rays shine on your skin, as ...