❓ why
Why does hair turn gray?
ScienceBiologyHuman Body
Quick Answer
Hair turns gray when the pigment-producing cells in follicles slow down and stop making melanin, so new hairs grow in colourless.
The Full Story
Hair colour comes from melanin, made by cells called melanocytes inside each follicle. As we age, these cells gradually become less active and eventually die, so new strands grow with little or no pigment and appear gray, silver, or white. Genetics largely determines when this begins, though stress and oxidative damage can play a role. A build-up of hydrogen peroxide in follicles also contributes by bleaching the hair from within. Gray hair is a natural part of ageing, not a sign of ill health.
Key Facts
1.Hair colour comes from the pigment melanin
2.Melanocyte cells slow and die with age
3.Genetics largely sets when graying starts
YouTube Angle
Suggested video title for this topic:
"Why Hair Goes Gray — The Chemistry of Ageing"