research Increased risk of vitamin D deficiency and insufficiency in Black patients with central centrifugal cicatricial alopecia 3 citations , February 2022 in “Journal of the American Academy of Dermatology” Black patients with a specific type of hair loss have a much higher chance of lacking enough vitamin D.
research Estimation of Vitamin D levels Among Female Students at University of Sciences and Technology, Aden, Yemen. A Cross-sectional Analysis March 2025 in “Yemeni Journal For Medical Sciences” Most female students in Aden, Yemen, have low vitamin D levels, causing health issues.