2 citations
,
January 2015 in “Sen'i Gakkaishi” This study found that washing hair after reduction in a permanent waving process allows for significant reformation of disulfide cross-links, enhancing the strength and elasticity of hair fibers.
47 citations
,
January 2017 in “RSC Advances” Keratin peptides can change hair shape gently without harsh chemicals.
35 citations
,
December 2014 in “Lasers in surgery and medicine” This study found that red light accelerated the transition from the resting to growth phase in hair follicles faster than green and blue light in mice, suggesting it may stimulate hair growth.
January 2013 in “프로그램북(구 초록집)” This review discusses the chemical processes involved in hair styling and straightening and reports no new results; the authors highlight pregnancy safety with hair treatments during pregnancy.
November 2017 in “Koubunshi rombunshuu/Kōbunshi ronbunshū” In this study, treatments using a shampoo and conditioner with hematin helped repair damaged hair by depositing a cuticle-like structure, straightening hair as observed through electron microscopy.
May 2026 in “Reactions Weekly” This study found that, compared to oxidative treatments, reductive perm-waving more severely impacts the intermediate filaments in European human hair, while both treatments alter denaturation kinetics in a first-order manner.
2 citations
,
July 2013 in “Acervo Digital da Universidade Estadual Paulista (Universidade Estadual Paulista)” This study found that the shampoo formulation with Polyurethane-14 and AMP-acrylates copolymer improved curl definition and reduced frizz and volume in natural and curly hair tresses compared to the control.
April 2024 in “Communications biology” The researchers reported that disrupting ATRA signaling by deleting RDHE genes in the hair follicle led to altered hair follicle cycles, composition, and gene expression, indicating RDHEs' role in hair follicle signaling coordination.
February 2010 in “Journal of the American Academy of Dermatology” The shampoo and conditioner improved dry, damaged hair significantly after three uses.
January 2026 in “SSRN Electronic Journal” Riboflavin with blue light speeds up hair dyeing, making it faster, safer, and long-lasting with less hair damage.
7 citations
,
May 2021 in “Applied sciences” This study investigated various proteins as eco-friendly hair perming agents for Asian hair and found that bovine serum albumin and keratin achieved perming results comparable to commercial products, while also increasing hair moisture, indicating a protective effect during heat styling.
2 citations
,
July 2013 in “Fashion business” This study found that keratin essence effectively protected hair structure against dye-induced damage, potentially improving coloring efficiency in damaged hair observed from a single individual.
July 2026 in “Journal of the American Academy of Dermatology”
January 2017 in “Nihon Keshouhin Gijutsushakaishi/Journal of S C C./Nihon Keshouhin Gijutsushakai kaishi” This study found that hair damage from sunlight and chemical processes like perms and bleaching varies in internal microstructure changes, suggesting that protective techniques should be tailored to the type of chemical treatment used.
April 2024 in “Advances in Redox Research” In this study, researchers found that polysulfides in human hair keratin contribute to hair strength and antioxidant capacity, with sulfur supplementation enhancing hair strength and cuticle structure amid oxidative stresses such as UV radiation.
4 citations
,
July 1987 in “Dermatologic Clinics”
2 citations
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January 2016 in “Scientifica” Researchers created a reliable method to measure dexpanthenol and resorcinol in hair products.
April 2023 in “The journal of investigative dermatology/Journal of investigative dermatology” In this study, researchers found that Derinat treatment in mice maintained the hair cycle in the anagen phase and reduced TRPCs-mediated intracellular ROS accumulation, potentially improving hair growth by altering the skin microenvironment.
January 2026 in “International Journal of Cosmetic Science” This study identifies key attributes—luminosity, structural integrity, and vitality—that define hair vibrancy, providing insights to guide the development of hair products that align with consumer expectations.
3 citations
,
January 2004 in “Sen i Gakkaishi” This study found that adding dithiodiglycolic acid to the hair straightening process decreased chemical damage and preserved the structural integrity of the hair matrix compared to using thioglycolic acid alone.
September 2023 in “International Journal of Cosmetic Science” The researchers reported that adding specific combinations of hydrolyzed proteins to silicone-free shampoo improved hair conditioning properties by reducing friction and increasing surface adsorption and penetration into hair, compared to protein-free alternatives.
January 2001 in “China Surfactant Detergent & Cosmetics” This study compared the protective effects of two conditioners, Protective factor C and Keratin, on hair damaged by perm treatment using a model of damaged hair.
April 2025 in “Pharmaceuticals” This study found that novel thiol-reactive cross-linking agents, particularly APA, significantly improved the tensile strength and elasticity of human hair fibers by effectively regenerating disulfide bridges, with potential applications for advanced hair repair treatments in the cosmetic industry.
12 citations
,
October 2007 in “PubMed” This study reports that keratin actives may protect various hair types from chemical damage, restore damaged fibers' mechanical strength, and reduce color fading.
3 citations
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September 2021 in “Data in brief” This study observed that bleaching brown human hair with persulfate salts and hydrogen peroxide induced significant conformational changes in keratin, particularly affecting disulfide bridges and oxidized sulfur species, which may inform the development of hair restorative treatments.
January 2026 in “International Journal of Biological Macromolecules” This study found that different polypeptides, including KP peptide and hydrolyzed keratin, can improve the mechanical properties of damaged hair under varying conditions, with reduction environments and cysteine content influencing their effectiveness.
May 2026 in “Jurnal Pendidikan Kimia Fisika dan Biologi” This study found that rebonding hair straightening treatments visibly damage the hair cuticle, causing surface erosion and cracks, as shown through Scanning Electron Microscopy analysis.
October 2024 in “Annals of Dermatology” In this in vitro study, red ginseng extract and its main ginsenoside, G-Rb1, were found to protect human hair follicular keratinocytes from oxidative damage, preventing apoptosis, promoting hair growth, and modulating hair cycle transitions by influencing specific cellular signaling pathways.
January 2014 in “University of the Arts London Research Online (University of the Arts London)” Certain ingredients can help protect hair color.