Why hair turns white

Hair turns gray or white when follicles lose pigment as melanin production declines. Aging and genetics influence when graying occurs, and prolonged stress can contribute. 1

• Stress-related adrenaline: Stress activates the sympathetic nervous system, increasing adrenaline-related signaling to hair follicles. This can activate peroxide groups in follicles, which contribute to bleaching, and can deplete pigment-producing melanocyte stem cells. 2 3
• Chronic stress and pigment cells: Melanocytes produce the pigment that gives hair its color; chronic stress-related depletion of these cells can reduce pigmentation over time. 4
• Genetics and possible mitigation: Graying rates vary with genetics and aging. Consistent stress-regulation practices such as meditation, and ample sunlight, may help offset stress-related graying. 5