Why Does Hair Turn Grey?
Hair doesn't turn grey — every strand grows out of the follicle completely colourless. So when greying happens, what's actually failing is the system that was adding colour all along.
In this episode, Jen, Chris, and Jamie unpack the biology of grey hair: the specialised cells that inject pigment into each strand as it grows, why those cells eventually stop working, and what a landmark study published in Nature revealed about stem cells getting physically stuck in the wrong part of the follicle. They also cover the hydrogen peroxide mechanism that bleaches hair from the inside, the Harvard…
The skinny
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