New research shows that to get an optimal vitamin D supplement from the sun at a minimal risk of getting cutaneous malignant melanoma (CMM), the best time of sun exposure is noon.
That means that common health recommendations given by authorities in many countries -- that sun exposure should be avoided for three to five hours around noon and postponed to the afternoon -- could be wrong and may even promote CMM.
This is in part because the action spectrum for CMM is likely to be centered at longer wavelengths than that of vitamin D generation.
Sources:
* Advanced Experiments in Medical Biology 2008; 624: 86-88
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