The human scalp has different types of pigment cells in hair follicles with varying abilities to produce pigment.
August 2023 in “International Journal of Molecular Sciences” The human scalp hair bulb contains different types of melanocytes with varying abilities to produce melanin.
16 citations,
November 2005 in “The journal of investigative dermatology. Symposium proceedings/The Journal of investigative dermatology symposium proceedings” Hair color is determined by different melanins and changes with age.
349 citations,
January 2005 in “The FASEB journal” Human skin can make serotonin and melatonin, which help protect and maintain it.
75 citations,
January 2009 in “International journal of trichology” Hair grays due to oxidative stress and fewer functioning melanocytes.