3 citations
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August 2008 in “PubMed” This study found that digital perm treatments using sodium thioglycolate lotion led to the most significant reduction in protein content and greater hair damage compared to other methods and lotions.
May 2009 in “International Journal of Cosmetic Science” In this study, permanent waving treatments, especially those using lotion B and repeated procedures, were found to significantly damage hair protein content and physical properties.
October 2024 in “Cosmetics” In this study, reducing agents like ammonium thioglycolate, L-cysteine, and sodium sulfite in shampoo effectively decreased hair flyaway and frizz without causing damage, as no critical hair damage was observed in structural and tensile strength assessments.
January 2024 in “Molecules (Basel. Online)” In this study, researchers examined juglone's potential as a restoring agent for hair keratin damaged by permanent or bleaching treatments, finding that juglone formed Michael adducts with cysteine residues, leading to a more regular hair surface as observed via IR spectroscopy and SEM analysis.
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.