52 citations,
February 2005 in “Biopolymers” Chemical hair straightening changes hair proteins and mostly fixes broken bonds.
45 citations,
December 2006 in “Biopolymers” Permanent waving weakens hair by altering its protein structure.
3 citations,
January 2021 in “ScienceAsia” Using an enzyme and keratin treatment can significantly repair and strengthen damaged hair.
25 citations,
May 2019 in “Heliyon” Hair treatments cause significant structural changes, especially with excessive heat, regardless of ethnicity.
May 2023 in “Antioxidants” Peptides from oysters may safely and effectively heal skin wounds with less scarring.