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No one knows why hair follicles stop producing melanin. Genetics mostly. There comes a point where the melanocytes (the melanin-producing cells) just stop producing. Thus you get gray hair.
WILL HAIR DYE GIVE YOU CANCER?
Every so often you hear about how chemicals in your cosmetics are responsible for cancer, birth defects or even autism. Unfortunately, the sources for these conclusions are rarely cited and, when they are, they are typically a biased political committee or marketing group.
An article titled “Can dyeing your hair really give you cancer?” recently caught our eye. The article discussed a major conference that was being held in Belfast in which the long-term link between bladder cancer and people with dyed hair was being discussed. It stated:
Evidence exists to indicate regular and long-term use of hair dyes can be associated with the development of the cancer, which kills more than 4,000 in the UK each year.
Now, if this article was all you read on the subject, you might conclude that hair dye causes bladder cancer. You might also get the impression that experts are in agreement. After all, they did get their information from Questor, a European environmental research center.