Ergocalciferol

Ergocalciferol is a form of vitamin D, also called vitamin D₂. It is marketed under various names including Deltalin (Eli Lilly and Company), discontinued Drisdol (Sanofi-Synthelabo), and Calcidol (Patrin Pharma). Created from viosterol when ultraviolet light activates ergosterol (found in fungi, it is named as a sterol from ergot), with fungi as the primary plant source.