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the claim

Skin produces vitamin D only under direct sunlight, not when a person is merely outdoors in the shade.

the verdict
INSUFFICIENT LEANING
Recorded sources
5 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that skin produces vitamin D only under direct sunlight, not when a person is merely outdoors in the shade?

Unclear. Several sources confirm that skin synthesizes vitamin D through exposure to ultraviolet sunlight, but none of them directly compares direct sunlight with merely being outdoors in the shade, so the specific claim about shade is not settled.

Verdict: PARTIAL LEAN · 5 sources for, 0 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 5
Association Between Vitamin D3 Deficiency and Postpartum Outcomes in Pregnant Women: A Systematic Literature Review and Meta Analysis
2025
Get citation
Al-Duhaidahaw, M. J., Al-Jubouri, B. S., & B, H. H. A. (2025). Association Between Vitamin D3 Deficiency and Postpartum Outcomes in Pregnant Women: A Systematic Literature Review and Meta Analysis. zenodo.org. https://doi.org/10.5281/zenodo.15777930

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More for · 4
Sunlight and Vitamin D: A global perspective for health -
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Sunlight and Vitamin D: A global perspective for health - PMC Lock. (n.d.). pmc.ncbi.nlm.nih.gov. https://doi.org/10.4161/derm.24494

How to Safely Get Vitamin D From the Sun
Get citation
How to Safely Get Vitamin D From the Sun. (n.d.). health.clevelandclinic.org. https://health.clevelandclinic.org/vitamin-d-from-the-sun

Vitamin D. Bone Health and a Lot More
2007
Get citation
Vitamin D. Bone Health and a Lot More. (2007). doi.org. https://doi.org/10.1016/s2173-5743(07)70247-2

Is Vitamin D production related to skin pigmentation?
2013
Get citation
Is Vitamin D production related to skin pigmentation?. (2013). skeptics.stackexchange.com. https://skeptics.stackexchange.com/questions/16397/is-vitamin-d-production-related-to-skin-pigmentation

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