Dear colleagues:

A few people have asked me whether one can make vitamin D via exposure to
sunlight from a window. The answer is that it depends on whether the glass
of the window is open or closed.

Exposure of the skin to sunlight that has passed through plexiglas (Dupont
Chemical Company, Memphis, TN, USA), most other plastics, or window pane
glass does not allow the endogenous production of vitamin D because these
materials efficiently absorb ultraviolet B radiation (Holick 1994). Without
UVB radiation, the skin cannot initiate the body's process of making
vitamin D.

Holick, M. F. McCollum Award Lecture: Vitamin D: New horizons for the 21st
century. Am J Clin Nutr 60: 619-30, 1994.

Sincerely,

Cynthia

Cynthia Good Mojab, MS clinical psychology, IBCLC, RLC
Ammawell
Email: [log in to unmask]
Web site: http://home.attbi.com/~ammawell

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