38 citations,
August 2012 in “Biochemical and biophysical research communications” Human leukocytes and beard hair follicle cells have internal daily clocks, and PER1 and PER3 genes may indicate individual circadian rhythms.
81 citations,
October 2014 in “The journal of investigative dermatology/Journal of investigative dermatology” Certain genes control the color of human hair by affecting pigment production.
92 citations,
September 2013 in “Journal of Investigative Dermatology” BMAL1 and Period1 genes can influence human hair growth.
6 citations,
December 2011 in “Nature” The circadian clock in skin cells controls their growth and rest cycles.
June 2016 in “CRC Press eBooks” Sleep problems and skin issues affect each other; poor sleep can worsen skin conditions, and some skin treatments can improve or harm sleep quality.