January 2025 in “Digital Repository (National Repository of Grey Literature)” In this study, analysis of questionnaire data from over 111,000 respondents revealed that red hair is significantly associated with a higher level of mental health problems in both men and women, while red-haired women also exhibited poorer overall physical health.
In this systematic review, researchers observed that Toxoplasma gondii infection is associated with alterations in testosterone levels, generally increasing in humans but showing mixed effects in animals, highlighting a complex relationship that warrants further investigation.
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October 2005 in “Experimental Dermatology” This review explores the role of Foxn1 in mammalian skin biology, discussing its influence on hair follicle function and the potential for further research to enhance understanding of epithelial differentiation.
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June 2020 in “Experimental dermatology” This study found that redheaded individuals had higher levels of vitamin D precursor 25(OH)D3 compared to non-redheaded individuals, suggesting a physiological adaptation to low UVB radiation in Europe.
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.