Characterizing the Individual: Hair Cortisol as a Biomarker of Mental Health and Functioning in a PhD Student Compared With a Clinical Sample

    Maike Hollandt, Jan Richter, Janine Wirkner
    Studysummary This study suggests that hair cortisol concentration may not reliably indicate psychological distress or differentiate clinical from non-clinical populations, as observed in a female PhD student over nine years.
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    Research cited in this study 5

    1. Hair Cortisol and Other Hair Analytes Decline With Storage Over a One-Year Period: A Systematic, Within-Subject Investigation Psychoneuroendocrinology · 2025
    2. Are Hair Cortisol Levels Dependent on Hair Growth Rate? A Pilot Study in Rhesus Macaques General and comparative endocrinology · 2023
    3. Hair Cortisol Concentrations in Mental Disorders: A Systematic Review Physiology & behavior · 2020
    4. Hair Cortisol Analysis: An Update on Methodological Considerations and Clinical Applications Clinical Biochemistry · 2018
    5. Hair as a Retrospective Calendar of Cortisol Production—Increased Cortisol Incorporation into Hair in the Third Trimester of Pregnancy Psychoneuroendocrinology · 2008