2 oz or 60 grams) of fresh mushrooms treated with ultraviolet light have increased vitamin D content to levels up to 80 micrograms or 3200 IU if exposed to just five minutes of UV light after being harvested.Button mushrooms with enhanced vitamin D2 content produced this way functions similarly to a vitamin D2 supplement; both effectively improves vitamin D status. Vitamin D2 from UV-irradiated yeast baked into bread or mushrooms is bioavailable and increases blood levels of 25(OH)D.

Names
Viosterol, the name given to early preparations of irradiated ergosterol, is essentially synonymous with ergocalciferol. However, currently, Viosterol is also the brand name for cholecalciferol (vitamin D3) in some countries.Ergocalciferol is manufactured and marketed under various names, including Deltalin (Eli Lilly and Company), Drisdol (Sanofi-Synthelabo) and Calcidol (Patrin Pharma). References
External links
"Ergocalciferol". Drug Information Portal. U.S. National Library of Medicine. NIST Chemistry WebBook page for ergocalciferol
The Yash Gandhi Foundation is a US non-profit organization which funds research for I-Cell disease

References
External links

mucolipidoses at NINDS — article derived from detail sheet available here
I cell disease at NIHs Office of Rare Diseases
GeneReview/NIH/UW entry on Mucolipidosis II