December 2019 in “bioRxiv (Cold Spring Harbor Laboratory)” This study found that redhaired individuals consistently had higher calcidiol levels compared to non-redhaired subjects, suggesting a physiological adaptation for vitamin D synthesis in low UV-B conditions.
January 2019 in “Figshare” This study found that redhaired individuals exhibit higher calcidiol levels compared to non-redhaired individuals, suggesting a possible evolutionary adaptation for vitamin D photosynthesis in low UV-B environments in Europe.
55 citations
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May 1985 in “Archives of Dermatology” This study found that alopecia in four children was linked to severe calcitriol-resistant rickets, suggesting this condition should be considered among inherited hair growth disorders.
53 citations
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October 1998 in “The journal of investigative dermatology/Journal of investigative dermatology” This study found that cyclophosphamide induced significant keratinocyte apoptosis in anagen hair follicles of mice, while topical calcitriol-analogs reduced this apoptosis, suggesting a protective effect against chemotherapy-induced alopecia.
11 citations
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May 1985 in “Archives of Dermatology” This study found that calcitriol-resistant rickets is associated with alopecia in children and should be considered in the differential diagnosis of hair loss.