There are two main forms of vitamin D that are important for human health: vitamin D2 (ergocalciferol) and vitamin D3 (cholecalciferol). While both forms serve similar functions in the body ...

Vitamin D2 is also known as "ergocalciferol," and vitamin D3 is also known as "cholecalciferol." This is important for patients who have purchased a dietary supplement that does not indicate the ...

D2, also known as ergocalciferol, comes from plant and fungus sources. It’s mainly produced by artificially exposing mushrooms or yeast to ultraviolet light, with the resulting product used in ...