157 citations
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April 1997 in “International journal of legal medicine” Cosmetic hair treatments like bleaching and dyeing reduce drug levels in hair samples.
1 citations
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October 2023 in “PloS one” Cosmetic hair treatments can increase hair testosterone levels, while natural hair color does not affect it.
63 citations
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August 1996 in “Forensic Science International” Cosmetic treatments like bleaching and perming can greatly reduce opiate levels in hair, possibly leading to false-negative drug tests.
January 2023 in “Research Square (Research Square)” Hair glycation could be a reliable non-invasive indicator of blood glucose control, but its use is limited by factors like sample collection and hair treatments.
1 citations
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September 2016 in “Brain Behavior and Immunity” Hair cortisol levels can indicate stress and are affected by washing frequency, not cosmetic treatments.