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Could one design an effective sun block which passes the spectrum necessary for Vitamin D synthesis?

April 26, 2017block design effective necessary passes promotes spectrum Sun synthesis vitamin d

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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 shouldnt block Vit D production.