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the claim

Vitamin D deficiency causes hair loss in adults.

the verdict
CONTESTED PARTIAL
Recorded sources
3 sources for · 1 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 vitamin D deficiency causes hair loss in adults?

Partly. One small cross-sectional study of 50 women and a telogen effluvium review support a link between vitamin D deficiency and hair loss, while a study of pregnant women with diffuse hair loss found no significant vitamin D difference. The evidence covers only narrow populations and does not establish that deficiency causes hair loss in adults generally.

Verdict: CONTESTED PARTIAL · 3 sources for, 1 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 · 3
Association of Ferritin and Vitamin-D (Calciferol) Deficiency with Female Pattern Hair Loss
2024
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Siddiqua, A., Rahaman, M. M., & Tauseef, S. (2024). Association of Ferritin and Vitamin-D (Calciferol) Deficiency with Female Pattern Hair Loss. doi.org. https://doi.org/10.3329/iahsmj.v6i1.75456

Evidence against · 1
Effect of zinc, ferritin, and vitamin B12 deficiency on hair loss in pregnant women
2022
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Mahdi, S. A. & Mohammed, H. A. (2022). Effect of zinc, ferritin, and vitamin B12 deficiency on hair loss in pregnant women. doi.org. https://doi.org/10.53730/ijhs.v6ns4.12005

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More for · 2
Comparative evaluation of vitamin D level in healthy dogs and affected to hair loss in Ahvaz city
2025
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Mosallanejad, B., Hoseinali, N., Tabatabaei, S. R. F., & Jalali, M. R. (2025). Comparative evaluation of vitamin D level in healthy dogs and affected to hair loss in Ahvaz city. sanad.iau.ir. https://sanad.iau.ir/journal/jvcp/Article/1128801

Acute Versus Chronic Telogen Hair Loss: A Review of the Knowledge and Recent Facts
2024
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Kubaisi, T. (2024). Acute Versus Chronic Telogen Hair Loss: A Review of the Knowledge and Recent Facts. doi.org. https://doi.org/10.33091/amj.2024.147465.1617

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