Why Does Hair Turn Gray? Scientists May Have Found a New Answer

A new study has shed light on the role our immune system could play in our hair turning gray when we deal with stress or illness.

Cells known as melanocytes make up melanin and give our hair its colour. Special stem cells then add melanocytes to new follicles when our hair falls out. When these stem cells stop working, our hair loses its pigment. It is this process and its relationship with our immune system’s defences that scientists at the National Institutes of Health and the University of Alabama, Birmingham, (UAB) set out to investigate—in mice.