September 2024 in “Journal of Family Medicine and Primary Care” This study found that primary health physicians in Saudi Arabia generally have low knowledge and practice scores regarding the use of vitamins and minerals for treating hair loss, with no significant difference between more or less experienced doctors.
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May 2022 in “Diagnostics” This study confirmed that 25(OH)D3 can be detected in hair samples from healthy young adults, but no correlation was found between hair and serum 25(OH)D3 concentrations, indicating limited potential as a standalone biomarker.
December 2025 in “Journal of Cell Communication and Signaling” This review discusses the role of vitamin D receptor signaling in hair follicle biology for alopecia treatment and underscores the need for continued research, without presenting new clinical results.
June 2015 in “Majallah-i 'ilmī-i dānishgāh-i 'ulūm-i pizishkī va khadamāt-i bihdāshtī darmānī-i Hamadān” This study found a significant relationship between lower vitamin D levels and hair loss in women, although no such significant link was observed in men.
Fair skin, not red hair, affects health due to possible vitamin D deficiency.