Most sunscreen block most of vitamin D and let the suntan wavelengths to get to the skin

Wanted : not block UVB, but block the UVA

Perhaps sunscreen pills being sold in 2012 will have a spectra more like wanted

Charts from http://www.detertec.com/sun_radiometry.html

Red = sunlight in space, Green = sunlight in Equator

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Red = sunlight in space, Green = sunlight in Equator Blue = sunlight in Albuquerque, NM

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Red = sunlight in space, Green = sunlight in Equator Blue = Vitamin D action spectra

No vitamin D is produced in UVA-1 or UVA-2

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Red = sunlight (probably on ground); other lines = amount of light filtered thru different sunscreens

We see than many sunscreen products do NOT block the upper UVA

This might be the reason that as people feel that they can stay out in the sun longer they get more cancer while getting less vitamin D

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See also VitaminDWiki

• Overview UV and Vitamin D

• Sunscreens which do not block UVB which makes vitamin D

• UV spectra to produce vitamin D which has the following graphic