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Hair turns gray as we age because the follicles at the base of the hair shaft cease to produce melanin. The darkness or lightness of the hair depends on how much melanin each strand contains.

articles.mercola.com/sites/articles/archive/2016/03/19/what-causes-gray-hair.aspx

Mar 19, 2016 ... As you age, the amount produced increases, which researchers believe ultimately bleaches out your hair pigment, turning your hair grey and ...

www.goodhousekeeping.com/beauty/hair/tips/a20712/gray-hair-facts

Oct 1, 2014 ... Scientists are hard at work trying to understand why our hair goes gray. Here are a few of the possible reasons.

www.webmd.com/beauty/features/abcs-premature-graying

Nov 14, 2012 ... A white person is considered to be prematurely gray if his or her hair ... or problems with your pituitary or thyroid gland can cause premature ...

www.nbcnews.com/health/gray-hair-cure-scientists-find-root-cause-discoloration-6C9802771

May 6, 2013 ... A team of European researchers claims to have found not only the root cause of gray hair, but also a treatment for the condition. Additionally ...

health.usnews.com/health-news/articles/2012/08/23/gray-hair-at-25-yes-heres-what-you-can-do

Aug 23, 2012 ... Check with a doctor to make sure you don't have a thyroid disorder; vitiligo, which causes areas of the skin and hair to become white; or anemia ...

www.huffingtonpost.ca/2017/05/10/what-causes-grey-hair_n_16539246.html

May 10, 2017 ... Grey hair is something many people have no interest in. Sure, it may be trendy to have granny-coloured hair on Instagram, and we're all for ...

www.cosmopolitan.com/uk/beauty-hair/hair/a37633/why-we-get-grey-hairs

Aug 3, 2015 ... Find out what makes hair turn grey in the first place with this expert ... seem to go grey earlier and some health conditions may cause premature ...

gaizupath.com/premature-gray-hair

Grey hair is becoming common nowadays and no one are able to get rid of this. Through the natural process of graying of hair is observed for long, however, ...

www.newsweek.com/gene-causes-grey-hair-has-been-identified-432200

Mar 1, 2016 ... It's well known that graying hair is caused primarily by genetics; if your parents went gray, you probably will, too. However, it's only now that ...