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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 ... Find out what causes gray hair based on studies. ... believe ultimately bleaches out your hair pigment, turning your hair grey and then white.

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 ... Find out what is causing your salt-and-pepper strands.

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.powerofpositivity.com/4-reasons-hair-turning-gray-early

“When your body stops generating melanin, hair presents itself as grey, white, ... or problems with your pituitary or thyroid gland can cause premature aging.

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 ...

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 ...

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 ...

timesofindia.indiatimes.com/life-style/beauty/Why-are-more-youngsters-developing-grey-hair/articleshow/23355744.cms

3 days ago ... Premature greying of hair due to an erratic lifestyle and other factors is a huge cause of stress today. Now, 50 shades of grey need not just be ...

www.loc.gov/rr/scitech/mysteries/grayhair.html

Parents often cite having teenagers as the cause of gray hair. This is a good hypothesis, but scientists continue to investigate why hair turns gray. In time ...