Sun block that promotes Vitamin D production

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Designing an effective sunblock that allows for Vitamin D synthesis while protecting against harmful UV radiation presents significant challenges. Vitamin D is synthesized in the skin primarily at wavelengths of 270-290nm, which falls just outside the UVA and UVB ranges. The discussion highlights that using salicylic acid as an active ingredient may not inhibit Vitamin D production. However, Vitamin D synthesis peaks at 297nm, within the UVB spectrum (280-315nm), indicating a complex relationship between preventing skin damage and allowing for Vitamin D metabolism. The ultraviolet action spectra for DNA damage, skin cancer, and Vitamin D3 photosynthesis are identical, complicating the development of a sunblock that effectively separates these processes.
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Could one design an effective sun block which passes the spectrum necessary for Vitamin D synthesis?
 
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Vitamin D is most succesfully synthesized in the skin at wavelengths of 270-290nm, which is just outside of the UVA and UVB spectra. A sunblock that uses salicylic acid as the effective ingredient shouldn't block Vit D production.
 
Vitamin D production peaks at 297 nm, right in the middle of the UVB band (280 - 315 nm), suggesting that separation of Vitamin D metabolism from burning will be difficult or impossible.

EDIT: "..the ultraviolet action spectra for DNA damage, skin cancer, and vitamin D3 photosynthesis are identical ..."
B. Gilchrest, American Journal of Clinical Nutrition, Vol. 88, No. 2, 570S-577S, August 2008
 
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