Vitamin D is available in two main forms — D2 and D3. (Credit: magic pictures/Shutterstock ... a randomized placebo-controlled trial. Mayo Clinic: Cholecalciferol (Oral Route). Medline Plus: ...

Vitamin D has two forms: D2 and D3. Vitamin D2 comes from plant-based sources. Vitamin D3 is found in some fish and produced ...

vitamin D2 (ergocalciferol) and vitamin D3 (cholecalciferol). While both forms serve similar functions in the body, there are differences in their sources, metabolism, and effectiveness.

The most common vitamin D compounds are vitamin D2 and vitamin D3, which come from different natural sources. Doctors generally prescribe vitamin D2 supplements if you have a vitamin D deficiency ...

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 ...