TLDR Vitamin D might be involved in hair growth, so taking supplements could help treat hair loss if you're deficient.
The article "Vitamin D Deficiency and Hair Loss: A Case Report and Review of the Literature for Diagnosis and Treatment" discusses the potential relationship between vitamin D deficiency and hair thinning. While comprehensive research on the direct link between vitamin D deficiency and hair loss in androgenetic alopecia (AGA) is still incomplete, the article suggests that vitamin D plays a role in hair growth. Therefore, if a vitamin D deficiency is identified in patients, supplementation could be considered as a potential medical treatment for hair loss.
Cited in this study
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13 citations
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August 2021 in “Journal of The American Academy of Dermatology” People with certain types of hair loss, especially lichen planopilaris and telogen effluvium, as well as African Americans, Asians, and men, are more likely to have severe vitamin D deficiency.
8 citations
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June 2020 in “International Journal of Dermatology” Men with early hair loss have lower vitamin D levels.
2 citations
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June 2018 in “Sudan journal of medical sciences” Low vitamin D levels can cause hair loss and supplements may improve it.
32 citations
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December 2017 in “International Journal of Molecular Sciences” Low vitamin D might be linked to certain types of hair loss, and supplements could help, but more research is needed.
23 citations
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July 2016 in “International Journal of Trichology” 
146 citations
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January 2004 in “Hormones” Human skin acts like a hormone-producing organ, making and managing various hormones important for skin and hair health.
5 citations
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January 2020 in “The mental health clinician” Vitamin D supplements may reduce hair-pulling in people with Trichotillomania.
July 2013 in “DeckerMed Medicine” The document's conclusion cannot be provided because the document is not readable or understandable.
2 citations
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February 2009 in “Journal of Evidence-Based Medicine” No treatment showed significant long-term hair growth benefits for alopecia areata.
