Gray hair linked to the immune system
Our hair is naturally white, but it is colored by a pigment called melanin, which is produced by cells called melanocytes. These are positioned in hair follicles. As each hair grows, it is infused with melanin. As we age, melanocytes slow down and slowly disappear, reducing the amount of pigment produced, leaving us with gray hair. Why some people go gray at a relatively young age is down to genetic