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research Research on Hair Bleach that Causes Less Hair Damage and Smells Less Pungent than Ammonium Hydroxide

2 citations , June 2018 in “Cosmetics”

This study found that using an aqueous solution of AMPD in hair bleach reduced both hair damage and odor compared to ammonium hydroxide.

research Protein loss in human hair from combination straightening and coloring treatments

18 citations , 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.

research Cytotoxic Evaluation of Hair Relaxers and Straighteners Actives in Human-Derived Skin Cells

1 citations , June 2021 in “Preprints.org”

This study demonstrated that hair relaxers containing common chemicals significantly reduced cell viability and increased apoptosis in human skin cells, suggesting potential toxicity that could be assessed with advanced in vitro technologies rather than animal testing.

research Impact of acid (”progressive brush”) and alkaline straightening on the hair fiber: Differential effects on the cuticle and cortex properties

November 2022 in “International journal of trichology”

This study found that glyoxylic acid caused more protein loss in hair compared to traditional alkaline straighteners, though both types of treatments showed comparable effects on hair tensile strength.