TLDR Men with early baldness often have low vitamin D levels.
The research paper "Study of Vitamin D Levels in Men with Premature Androgenetic Alopecia" conducted a study on 50 men aged 18-30 years with premature androgenetic alopecia. The study aimed to establish a correlation between serum vitamin D levels and the severity of premature androgenetic alopecia. The results showed that 82% of the participants (41 patients) had a vitamin D deficiency (<20 ng/L), and 14% (7 patients) had insufficient vitamin D levels (21-29 ng/L). The study found a significant positive correlation between vitamin D deficiency and the severity of androgenetic alopecia, suggesting that vitamin D may play a role in the premature onset of androgenetic alopecia. However, the paper concludes that further studies on a larger population and the effect of vitamin D supplementation on the progression of androgenetic alopecia are required to validate these findings.
20 citations,
January 2019 in “International journal of trichology” People with Alopecia areata often have lower Vitamin D levels, which might affect the severity of their condition.
23 citations,
September 2016 in “Archives of Dermatological Research” Vitamin D levels do not affect the risk of developing alopecia areata.
20 citations,
May 2016 in “Journal of Cosmetic Dermatology” Low vitamin D receptor levels found in hair loss patients; topical vitamin D treatment suggested.
105 citations,
March 2014 in “British journal of dermatology/British journal of dermatology, Supplement” 
11 citations,
January 2014 in “Egyptian Journal of Dermatology and Venereology” Women losing hair might have lower levels of vitamin D.
2 citations,
December 2021 in “Cureus” Low vitamin D levels are linked to hair loss, and vitamin D might help treat it.
8 citations,
June 2020 in “International Journal of Dermatology” Men with early hair loss have lower vitamin D levels.
September 2023 in “Clinical, Cosmetic and Investigational Dermatology” Higher SHBG levels are linked to less severe hair loss in women, but vitamin D levels don't seem to affect hair loss.
May 2023 in “GLOBAL JOURNAL FOR RESEARCH ANALYSIS” Early onset hair loss is linked to low vitamin D, but severity isn't related to vitamin D levels.
September 2018 in “International Journal of Dermatology” People with alopecia areata often have lower levels of zinc and vitamin D.
32 citations,
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.
