Hair Graying Update and Review Actas Dermo Sifiliogrficas Most people think grey hair is just aging, but your biology sends the signal long before the color changes. Researchers have already mapped out the internal pathways that switch pigment on or Natural products and their derivatives as candidate treatments for hair greying: from drug discovery to molecular mechanisms Chinese Medicine Springer Nature Link Gray Hair: Causes and What Research Says About Prevention Human Hair Graying Revisited: Principles, Misconceptions, and Key Research Frontiers ScienceDirect