Black hair growth primarily relies on melanocytes in the hair roots. As we age, pigment cells at the hair follicle base cease or reduce melanin production, resulting in gray hair.Duan Xingwu, Director of Dermatology at Dongzhimen Hospital, explains that normal hair appears black due to the presence of melanin and melanin granules, while gray hair lacks these granules. Additionally, he advises against forcefully pulling out gray hairs. While plucking won't cause more gray hair to grow, it can damage the hair root. Excessive plucking may even lead to folliculitis.
When graying becomes noticeable, many opt for hair dye. Experts advise embracing natural aging instead. While the carcinogenic potential of hair dyes remains inconclusive, these chemical products carry risks like allergies. Given the scalp's proximity to the brain, frequent chemical exposure may harm nearby organs—particularly for individuals with compromised immunity.
Duan Xingwu explains that gray hair caused by aging is a normal physiological process with minimal reversibility. However, premature graying occurs in some individuals for various reasons: genetic factors are rarely reversible, while stress, emotional state, nutrition, and chronic diseases may be reversible causes.
How can one protect hair and minimize premature graying? Experts recommend: first, maintaining mental relaxation and adequate sleep; second, engaging in moderate exercise to promote overall blood circulation; third, performing localized scalp massage; fourth, consuming foods rich in B vitamins and pigment-rich ingredients like black beans, wood ear mushrooms, black sesame seeds, and Ligustrum lucidum berries.