5 citations
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June 2020 in “Therapeutic drug monitoring” This study found that hair sample weight was a better predictor of hair cortisol concentration than hair protein concentration, suggesting that using the standard cortisol-to-weight ratio is more suitable for measuring cumulative cortisol activity in scalp hair.
January 2026 in “Open Science Framework” This study examines various methodological factors affecting hair cortisol concentration analysis, finding inconsistent results on the impact of factors like resuspension solution, hair weight, extraction duration, and hair-cutting method.
567 citations
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October 2007 in “Clinical and investigative medicine” This study described a new assay for measuring cortisol in hair and found it may serve as a useful biomarker for long-term cortisol exposure, correlating with 24-hour urine cortisol levels in non-obese subjects.
This study found that a hair growth rate of 0.75 cm/month better matches retrospective cortisol timelines and identified factors influencing hair cortisol content in children and adolescents.
50 citations
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June 2014 in “Experimental and Clinical Endocrinology & Diabetes” This study found that hair cortisol levels increase and testosterone levels decrease with obesity, suggesting that measuring hormones in hair may be a valuable tool in obesity research and clinical practice.