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7-dehydrocholesterol (sometimes known as provitamin D3) is a chemical that, in the presence of ultraviolet light, is converted by the body to previtamin D3 which is then isomerized into Vitamin D3.

See also:

• cholesterol

External links:

• http://www.umich.edu/~biophys/faculty/sension/
• http://www.merck.com/pubs/mmanual/section1/chapter3/3d.htm
• PREVITAMIN D CONFORMATIONS AND ESTIMATION ON THEIR ROLE IN THE WAVELENGTH DEPENDENCE OF PREVITAMIN D PHOTOSYNTHESIS IN VITRO (http://www.photobiology.com/photobiology99/contrib/olga/)