Why Does Hair Turn Gray? How Stopping Oxidative Stress Can Prevent Grey Hair Arey Stress sensing in the human greying hair follicle: Ataxia Telangiectasia Mutated (ATM) depletion in hair bulb melanocytes in canities prone scalp Scientific Reports New findings suggest how stress may trigger gray hair Harvard Gazette Why does hair turn gray or white? Cause of grey hair may be 'stuck' cells, say scientists