October 2023 in “Journal of Pakistan Association of Dermatologists” This randomized control trial reported that patients with alopecia areata typically have lower serum Vitamin D levels, and treatment with topical vitamin D3 analogue calcipotriol led to significant hair regrowth in 71% of participants over six months.
January 2024 in “Journal of advanced research in Medical and Health science” This study observed that vitamin D deficiency in alopecia areata correlates inversely with disease severity and duration, but does not correlate with serum vitamin D levels.
March 2023 in “Pakistan Journal of Medical & Health Sciences” This study found that alopecia areata patients often had low vitamin D levels, and topical calcipotriol treatment significantly reduced the severity of their hair loss.
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October 1987 in “British journal of dermatology/British journal of dermatology, Supplement” This study found that a topical vitamin D3 analogue had an anti-proliferative effect on guinea pig skin epidermis.
January 2026 in “Annals of Dermatology”