research Treatment of Alopecia Totalis, Universalis, and Focalis with Vitamin D and Analogs: Three Case Reports and a Literature Review 3 citations, November 2021 in “World Journal of Clinical Pediatrics” Vitamin D might help treat some types of hair loss, but more research is needed.
research Symptomatic Hypercalcemia and Scarring Alopecia as Presenting Features of Sarcoidosis 6 citations, March 2018 in “Proceedings - Baylor University. Medical Center” Sarcoidosis can cause severe high calcium levels, hair loss, and kidney failure.