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This study found that hair cortisol concentration is consistently associated with salivary cortisol output throughout the day, making it a potential reliable biomarker of long-term cortisol secretion.

This study found that hair cortisol concentration is a promising stress indicator in cattle but not in pigs, where external factors and lower cortisol response may interfere with its validity.

This study found that plasma protein binding significantly contributes to the shifts in glucocorticosteroid concentration ratios among blood, saliva, and hair, challenging prior assumptions about enzyme inactivation as the main factor.

This study suggests that measuring scalp hair 17-hydroxyprogesterone and androstenedione concentrations can be a promising tool for monitoring treatment in children with congenital adrenal hyperplasia.

In this review, researchers examined the concentration of cortisol in scalp hair of individuals with alopecia areata to explore its relationship with disease variables, as cortisol in hair can indicate chronic stress, which may impact alopecia areata pathogenesis.

This study observed that in privately owned, intact cats, male cats exhibited significantly higher long-term hair cortisol concentrations compared to females, while environmental and behavioral factors did not significantly impact cortisol levels, suggesting individual traits may influence stress markers more than external factors.

This study observed that pregnant women experienced an increase in hair cortisol concentrations, with primiparae having significantly higher levels in the last trimester compared to multiparae.

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.

Hair cortisol concentration partly reflects HPA axis regulation but doesn't capture all its complexities.

Lye relaxers don't significantly change hair cortisol levels.

This article reviews the use of hair cortisol concentration as a biomarker to assess long-term stress in both animals and humans, but it reports no new experimental results.

This study reported that relocation in police horses was associated with elevated hair cortisol concentrations, possibly suggesting altered welfare due to changed surroundings, and that seasonal variations affected both cortisol levels and hair growth.

This study found that in lactating Holstein cows, hair from the tail switch, which grows faster and is more sensitive to cortisol changes, is ideal for measuring hair cortisol levels.

This study of Danish women found no evidence linking hair cortisol concentration to hair dyeing status or the frequency of hair washing.

This study found that alcohol dependence is associated with altered HPA axis functioning, with AD patients showing higher hair cortisol concentrations and reduced ACTH and cortisol levels, irrespective of childhood maltreatment history.

This study found that female patients with anorexia nervosa had lower hair cortisol concentration compared to healthy and psychiatric controls, which may be influenced by body mass index rather than anorexia-related endocrine changes.

This study found that methanol is more effective than isopropanol at removing external cortisol from grizzly bear hair and suggests that the choice of solvent can influence hair cortisol concentration results.

In this study, washing rhesus monkey hair with water or shampoo significantly reduced cortisol levels, suggesting potential underestimation of chronic stress hormone deposition in hair due to washing.

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.

This study found that in domestic cats, black hair contained significantly higher cortisol concentrations than white hair, whereas ginger hair showed no significant difference compared to white hair. Additionally, a positive correlation was reported between hair cortisol levels and behavioral issues mentioned by cat owners.

This study found that women undergoing mid-trimester termination of pregnancy exhibited increased cumulative cortisol and testosterone levels in hair samples, higher anxiety, but better stress coping strategies two months post-abortion, suggesting hair testosterone may be linked to emotional vulnerability such as neuroticism during this period.

In this study, hair from forearms showed higher cortisol levels than hair from lower legs, suggesting a localized cortisol response in hair.

This study found that hair cortisol concentrations in sheep were significantly increased by extensive brushing or dexamethasone treatment, suggesting that external factors may affect its reliability as a chronic stress measure.

This study found that school-related stress increases hair cortisol in girls and alters hair testosterone and cortisol levels in boys, indicating gender-specific hormonal responses to environmental changes.

This study reports that hair samples can be used to track chronic hormone levels, revealing stress, reproductive, and sodium regulation patterns in wildebeest related to environmental factors.

This study observed that hair cortisol and cortisone concentrations were higher in older individuals and those with diabetes mellitus, highlighting their potential significance for assessing somatic health.

In this randomized trial, a solid shampoo formulated with plant extracts was more effective than placebo in improving androgenetic alopecia and reducing hair cortisol and DHT concentrations in men.

This study found that older steers had higher hair cortisol concentrations compared to younger steers, suggesting age affects chronic stress biomarkers in beef cattle.

This study found that hair cortisol concentrations in rhesus macaques were not significantly correlated with hair growth rate, suggesting that cortisol-mediated inhibition of hair growth does not explain higher cortisol levels within the non-stress range.

This study found significantly higher hair cortisol concentrations in black children compared to white children aged 1-4 years, suggesting racial differences in cumulative stress as measured by hair cortisol.