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April 2005 in “Experimental Dermatology” Stressed fibroblasts greatly increase melanin production in hair, skin, and eye cells, mainly due to a growth factor called bFGF.
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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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April 2002 in “The American Journal of Medicine” St. John's Wort can cause dangerous high blood pressure if taken with certain foods.
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April 2013 in “SpringerPlus” Human skin's melanocytes respond to light by changing shape, producing pigments and hormones, which may affect sleep patterns.
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November 2000 in “Archives of General Psychiatry” Testosterone is important for men's sexual function, may help some women's sexual desire, while other hormones and neurotransmitters also play complex roles in sexual behavior.