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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.
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January 2019 in “Sleep medicine” Night shift work disrupts the body's natural clock genes.
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June 2006 in “Journal of Investigative Dermatology” Beard and scalp hair cells have different gene expressions, which may affect beard growth characteristics.
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May 2006 in “Journal of Investigative Dermatology” Dexamethasone may influence hair growth by altering estrogen receptor activity in hair cells.
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April 1994 in “Clinical endocrinology” Androgens can cause hair growth in some areas and hair loss on the scalp.