TLDR Lye relaxers don't significantly change hair cortisol levels.
The study investigated the effects of lye relaxers on hair cortisol concentrations (HCC) with a sample of 14 participants. The results indicated that lye relaxers do not significantly reduce measurable HCC, although Bayesian analysis suggests a 55% probability that untreated hair has higher cortisol levels. The study highlights the importance of including diverse populations, particularly Black and Latinx communities, in hair cortisol research to address cultural and methodological biases. Limitations include the inability to examine real-world post-treatment practices that may affect hair chemistry.
1 citations
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December 2022 in “Middle East Journal of Science” Permanent hair dyes use chemicals that react with hydrogen peroxide to create color.
February 2022 in “Cosmetic Dermatology” Permanent hair waving uses chemicals to create long-lasting curls.
2 citations
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January 2022 in “Anais brasileiros de dermatologia/Anais Brasileiros de Dermatologia” Chemical hair straighteners can cause scalp and hair damage, but long-term effects are unclear.
30 citations
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September 2018 in “International Journal of Cosmetic Science” Bleaching hair causes severe structural and chemical damage, including protein loss and oxidation.
20 citations
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July 2009 in “Journal of Pediatric and Adolescent Gynecology” Quick treatment of hair disorders in teenage girls is important because of the emotional effects.
January 2011 in “Yearbook of Dermatology and Dermatologic Surgery” Hair relaxers are linked to reduced cystine levels and potential hair damage.
8 citations
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October 2014 in “Journal of analytical toxicology.” Chemical hair straightening significantly reduces detectable drug levels in hair.
29 citations
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May 2007 in “British Journal of Dermatology” Hair relaxers can cause lasting scalp damage and hair loss.
March 2010 in “Cosmetic Dermatology” Hair straightening methods have advanced to improve effectiveness and reduce damage, but still rely on heat and chemicals.
