3 citations
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May 2009 in “International Journal of Cosmetic Science” This study investigated the effects of different relaxer treatments on African-American hair, finding lab-made relaxer solutions caused less damage to hair topography than commercial systems.
March 2010 in “Cosmetic Dermatology” Hair straightening methods have advanced to improve effectiveness and reduce damage, but still rely on heat and chemicals.
18 citations
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July 2015 in “Journal of cosmetic dermatology” This study observed that combining hair dyeing with sodium hydroxide relaxers drastically increased protein loss in Caucasian virgin dark brown hair, while ammonium thioglycolate or guanidine hydroxide relaxers caused less damage.
4 citations
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July 2016 in “Journal of cosmetic dermatology” This review discusses the potential risks and effects of chemical relaxers on hair and scalp health, reporting no new clinical results; the authors emphasize dermatologist guidance to mitigate these issues.
January 2011 in “Yearbook of Dermatology and Dermatologic Surgery” Hair relaxers are linked to reduced cystine levels and potential hair damage.