Vitamin D Sufficiency Promotes Growth After Hair Shedding

In one case report published in Annals of Dermatology, a 7-year-old boy with reduced vitamin D receptor (VDR) expression in alopecia areata had new hair growth after six weeks2 of applying a topical vitamin D analog (calcipotriol) daily. Complete regrowth was found after three months of application, and no hair loss was observed for the next six months.