August 2025 in “Chronobiology International” In this study, college students with an evening chronotype were found to be at greater risk for androgenetic alopecia, potentially due to altered circadian rhythms as indicated by shifts in heart rate patterns and clock gene expression in hair follicles.
10 citations
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August 2014 in “Skin research and technology” This study found that variations in sleep patterns, free testosterone, and 5-alpha-reductase type 1 activity are associated with changes in sebum excretion in women, which may contribute to variability in acne studies.
220 citations
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August 1988 in “Clinical endocrinology” This review provides a comprehensive overview of melatonin's physiological roles, effects, and clinical implications, but it does not present new experimental findings.
47 citations
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May 1999 in “Reproduction” This study found that temperature affects the influence of daylength on prolactin secretion and hair growth in dairy goats, without significant involvement of melatonin.
38 citations
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June 2017 in “The Journal of Dermatology” This review synthesizes recent findings on the hair follicle stem cell niche and its complex interactions, exploring potential pathways for developing new hair growth therapies; it reports no new clinical results.