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.
39 citations
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June 2019 in “Nanomaterials” This paper suggests that coating hair with drug-loaded nanotubes may offer durable drug delivery and color applications, with potential for both human and veterinary uses.
19 citations
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April 2021 in “Journal of Cosmetic Dermatology” This study found that a hair care treatment using integral silk proteins and linseed-derived polysaccharides effectively protected and repaired bleached and colored hair swatches, significantly improving their resistance, luster, and reducing structural damage after chemical treatments.
May 2026 in “Brazilian Journal of Hair Health” This study found that bleaching significantly damages hair structure and increases combing difficulty, while dyeing with emulsifiers can partially reduce damage and improve combability, yet both processes cause notable protein loss.
1 citations
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October 2023 in “PloS one” This study found that testosterone concentrations in hair samples were moderately stable over three months, with cosmetic treatments like coloring increasing testosterone levels, while natural hair color in untreated hair did not affect testosterone measurements.