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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.

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 ... Whatever you call it, gray hair happens to all of us at some point. ... or problems with your pituitary or thyroid gland can cause premature ...

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.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 ...

time.com/4770554/grey-hair-loss

May 8, 2017 ... A study in mice found the cells that cause hair to go bald or turn gray, which may one day lead to a remedy for hair loss and graying.

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.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.

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

Apr 25, 2017 ... 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 ...