Increased calcidiol level in redhaired people: Could redheadedness be an adaptation to temperate climate?
J. Flegr, K. Sykorova, V. Fiala, J. Hlavacova, M. Bicikova, L. Macova, S. Kankova
The paper investigates calcidiol and folic acid levels in redhaired and non-redhaired individuals, finding higher calcidiol in redhaired people and suggesting a physiological adaptation to low UV-B radiation.
bioRxiv · Dec 30, 2019 · PreprintEvolutionary Biology