TLDR The levels of zinc, vitamin D, ferritin, and selenium are different in people with androgenic alopecia compared to a control group.
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July 2021 in “Journal of pharmaceutical research international” 
1 citations
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April 2021 in “International Journal of Research in Dermatology” Low iron and vitamin B12 levels are common in women with chronic hair loss, while low vitamin D is less common.
6 citations
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January 2021 in “Journal of Nutritional Science and Vitaminology” Taking vitamin D3 pills helped improve hair growth in women with a certain type of hair loss.
8 citations
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June 2020 in “International Journal of Dermatology” Men with early hair loss have lower vitamin D levels.
1 citations
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December 2011 in “Dermatologica Sinica” Women using hair relaxers with alopecia had lower zinc levels, suggesting zinc deficiency might contribute to hair loss.