567 citations
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October 2007 in “Clinical and investigative medicine” Hair cortisol can be used to measure long-term stress exposure.
Hair cortisol content can indicate cortisol exposure and varies with age, puberty, and BMI in youth.
April 2026 in “Comprehensive Psychoneuroendocrinology” November 2025 in “Canadian Journal of Diabetes” Measuring cortisol in hair helps understand stress and manage related health issues.