November 2023 in “Journal of animal science/Journal of animal science ... and ASAS reference compendium” In this study, researchers examined the genetic factors impacting cortisol and DHEA concentrations in the hair of healthy pigs; they found that cortisol levels were heritable and genetically correlated with behavioral stress responses, suggesting these hormones could potentially serve as indicators for selecting disease-resilient pigs.
March 2025 in “medRxiv (Cold Spring Harbor Laboratory)” This study found that hair proteomics may serve as a promising, non-invasive biomarker source for stress-associated psychopathology, showing high accuracy in distinguishing patients with non-suicidal self-injury disorder from healthy controls.
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December 2021 in “Scientific reports” In this study, scalp hair sweating was a significant predictor of hair cortisol levels in healthy adults, while BMI and perceived stress, although associated, did not significantly predict cortisol levels.
November 2025 in “Psychoneuroendocrinology” This study reported that machine learning analysis of protein profiles in hair segments achieved high accuracy in distinguishing women with non-suicidal self-injury disorder from healthy controls, suggesting hair proteomics as a promising non-invasive biomarker for stress-related psychopathology with potential clinical applications.
November 2022 in “Innovation in aging” This study reports that hair cortisol measurement in older Puerto Rican adults found a significant portion had non-detectable cortisol levels, especially among black participants, influencing exclusion rates in such populations.