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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 found no significant difference in hair cortisol concentrations, a chronic stress indicator, between sows in farrowing crates and those in loose-housing systems.

In this study, researchers found that high hair cortisol levels, indicating stress in cows, were associated with certain shelter and cow-level conditions such as unclean environments and physical injuries.

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.

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 developed a new method for detecting 30 hormones in anti-aging functional foods, demonstrating good sensitivity and reliability, and identified seven hormones in four out of 14 samples tested.

In this study, researchers reported no statistically significant association between hair cortisol levels and either perceived stress or objective neuroendocrine stress measures in a predominantly male participant group.

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 found that collecting hair samples for cortisol analysis is feasible in community-dwelling individuals with longstanding multiple sclerosis, although no significant correlation between hair cortisol levels and perceived chronic stress was observed, highlighting the complexity of stress measurement in this population.

This study examined sheltered and adopted domestic cats, finding that dark coat color and living environment significantly influence hair cortisol and DHEA levels as stress indicators, while age and sex do not; adoption was associated with reduced long-term stress, underscoring its benefits for feline welfare.

This study introduced a validated LC-MS/MS-based method for profiling long-term steroid concentrations in human scalp hair, offering potential applications in endocrinology research.

This study found that piglets' rapid growth during nursery and lactation was linked to changes in microbiota composition and increased cortisol conversion, highlighting critical early life factors influencing adult microbiota establishment.

This study found that clippers are the safest and most efficient tool for collecting hair samples from companion dogs, with no impact on cortisol concentration compared to scissors.

This study reports that 11β-HSD1 activity in human skin increases with age and photoexposure, potentially contributing to skin aging and the effects of glucocorticoids.

This study found that wolves in heavily hunted areas of Canada's tundra–taiga exhibited higher levels of stress and reproductive hormones, indicating social instability and increased reproductive effort due to human-caused mortality.

In this study, manipulation of the enzyme 5α-reductase type 2 in human hepatocytes altered lipogenesis, suggesting clinical implications for patients using 5α-reductase inhibitors by affecting glucocorticoid action on hepatic lipid metabolism.

This review discusses the use of hair analysis for examining stress and reproduction hormone levels in wildlife and highlights the need for more comprehensive physiological validations across species.

This study used a glucocorticoid-injection model to mimic kidney-yang deficiency syndrome and reported symptoms related to hormonal imbalances in the hypothalamic-pituitary-target gland axes.

The new method can measure sleep-related hormones in hair effectively and could help track long-term sleep patterns.

This study found that individuals with a recent history of suicide attempts exhibited altered DHEA hair levels, suggesting possible dysregulation of the HPA axis as a biopsychosocial feature, and recommends further investigation into hair hormones as potential markers of suicidal crisis and vulnerability.

This study found that hair steroid profiling is a feasible, non-invasive alternative to serum analysis in adolescents, with androgen levels correlating more strongly with body size and composition in boys than girls.

In this review, researchers explored hair as a promising tool for identifying biomarkers in schizophrenia, highlighting its potential for supporting personalized medicine through ease of sampling, though acknowledging challenges like individual variability and methodological inconsistencies.

In this study, researchers used the CRISPR/Cas9 system to edit the FGF5 gene in Dorper sheep, observing increased density and finer wool, along with changes in cortisol levels and antioxidant enzyme activity linked to hair follicle development.

This study found that lower salmon availability was associated with higher stress hormone levels in grizzly and black bears, influencing their physiological responses and competitive behaviors.

This study highlights how the COVID-19 pandemic has exacerbated stress-related dermatological issues like acne and hair loss by affecting skin and hair cycles through stress hormones, emphasizing the need for comprehensive psychoneuroendocrine-informed approaches to diagnosis and treatment.

This review highlights that recent advancements in diagnostics and therapies, including AI-enhanced imaging, biomarker analysis, and novel treatments like low-dose oral minoxidil and JAK inhibitors, are improving the precision and customization of hair loss management.

In this study, combining medical treatments, natural remedies, dietary guidance, and stress management achieved the best outcomes for hair regrowth and patient satisfaction in Cambodia, highlighting the importance of a multifaceted approach for effective hair loss prevention and treatment.

In this study, researchers observed that heat stress significantly affected hair and skin traits in two indigenous goat breeds, with Kodi Aadu goats demonstrating greater thermal resilience compared to Kanni Aadu goats, potentially due to differences in gene expression and methylation.

This abstract discusses advancements in hair transplantation technology, highlighting the role of robotics and follicular unit extraction/grafting in achieving excellent clinical outcomes, with adjuvant treatments like platelet-rich plasma, lasers, and stem cells potentially improving the durability and appearance of results.

This study found that cortisone reductase deficiency is caused by inactivating mutations in the H6PD gene, affecting cortisol metabolism by preventing 11β-HSD1 enzyme function.