July 2022 in “The journal of investigative dermatology/Journal of investigative dermatology” This study suggests that Myelin Protein Zero-like 3 plays a crucial role in hair follicle cycling by regulating anagen and catagen phases, mediated through mitochondrial signaling mechanisms in both human and murine hair follicles.
90 citations
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July 2014 in “Conservation Physiology” This study found that hair cortisol concentration in free-ranging brown bears is influenced by handling methods, body condition, and potentially both short- and long-term stressors.
85 citations
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January 2014 in “Hormone Research in Paediatrics” This study found that hair cortisol concentrations can be reliably measured in healthy children and generally increase with age, unaffected by gender, puberty, or hair care practices.
50 citations
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November 2020 in “Physiology & behavior” This review found that patients with depression generally have higher hair cortisol concentrations compared to healthy controls, while those with PTSD tend to have lower concentrations.
33 citations
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January 2017 in “Psychoneuroendocrinology” This study of Danish women found no evidence linking hair cortisol concentration to hair dyeing status or the frequency of hair washing.