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Background:  Cortisol level in human hair would be an endogenous biomarker for the retrospective assessment of long-term central hypothalamo-pituitary-adrenal activity. However, no direct evidence supports that blood-related diffusion is a biologically endogenous source of hair cortisol in humans. The present study aims to validate the direct correlation between cortisol in 1-cm hair segments and salivary cortisol in healthy humans.

Correlation of cortisol in 1-cm hair segment with salivary cortisol in human: hair cortisol as an endogenous biomarker