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February 2005 in “The FASEB journal” Human skin can make serotonin and melatonin, which help protect and maintain it.
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July 2003 in “European journal of biochemistry” Mouse skin can produce and process serotonin, with variations depending on hair cycle, body location, and mouse strain.
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August 2006 in “Journal of Investigative Dermatology” Stress can worsen skin and hair conditions by affecting the skin's immune response and hormone levels.
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March 2018 in “Journal of Investigative Dermatology” Melatonin may benefit skin health and could be a promising treatment in dermatology.