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This study found that hair cortisol did not indicate expected hypercortisolism in acutely underweight anorexia nervosa patients and did not change significantly during short-term weight restoration.

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 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.

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.