220 citations
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August 1988 in “Clinical endocrinology” Melatonin may help with sleep issues, depression, and cancer, but more research is needed.
116 citations
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May 2013 in “Proceedings of the National Academy of Sciences of the United States of America” Hair grows faster in the morning and is more vulnerable to damage from radiation due to the internal clock in hair follicle cells.
38 citations
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September 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.
103 citations
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December 2021 in “Journal of biological rhythms” Shift work disrupts the body's natural clock, leading to health problems.
28 citations
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June 2017 in “Molecular ecology” Researchers found genes that control hair color and growth change before the visible coat color changes in snowshoe hares.