Does hair cortisol concentration reflect measurable regulatory biology of the HPA axis in healthy humans?

Key Points

• Hair cortisol concentration correlates with measurable regulatory biology of the HPA axis, suggesting its significance.
• The study reports a significant relationship between hair cortisol levels and HPA axis function.
• Observational analysis examined cortisol concentration in hair samples from healthy individuals over time.
• Findings support hair cortisol as a potential biomarker for assessing stress response regulation.