October 2021 in “International Journal of Research in Dermatology” This study found that individuals with alopecia areata had significantly lower vitamin D levels compared to healthy controls, and lower vitamin D levels were associated with more severe hair loss.
January 2021 in “İzmir Dr.Behçet Uz çocuk hastanesi dergisi” This study found that children with alopecia areata had significantly lower levels of vitamin D and B12, and higher thyroid-stimulating hormone and free T4 levels compared to healthy children.
March 2014 in “Journal of The American Academy of Dermatology” Vitamin D deficiency is common in temporary hair loss, and stress is often a suspected cause.
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April 2004 in “The journal of investigative dermatology/Journal of investigative dermatology” This study found that mice lacking the 1αOHase enzyme, which is responsible for producing a key vitamin D metabolite, showed impaired epidermal differentiation and delayed recovery of skin barrier function after disruption.
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March 1985 in “Journal of Clinical Investigation” This study found that measuring 24-OHase induction by 1,25(OH)2D3 in cultured skin fibroblasts is a sensitive test for detecting genetic defects in the 1,25(OH)2D effector pathway.