25 citations
,
May 2019 in “Cosmetics” 18-MEA and cationic surfactants can restore and maintain hair's hydrophobic nature, improving its beauty and feel.
4 citations
,
November 2024 in “Scientific Reports” 16-MHA can restore damaged hair's protective barrier and moisture balance.
June 2024 in “ChemBioChem” Replenishing free 18-MEA can help restore damaged hair surfaces.
April 2024 in “Research Square (Research Square)” 16-MHA can restore the barrier and moisture of damaged hair, making it similar to undamaged hair.
January 2011 in “Journal of Society of Cosmetic Chemists of Japan” 18-MEA and SPDA can restore damaged hair's smoothness and reduce frizz.
24 citations
,
April 2016 in “Experimental Dermatology” Chemical treatments like dyeing, perming, and bleaching damage hair by altering amino acids and lipids.
27 citations
,
May 2019 in “Cosmetics” The hair cuticle is made of tough proteins that protect the hair, but more research is needed to fully understand its structure.
25 citations
,
December 2011 in “Surface and interface analysis” Bleaching hair causes significant damage by breaking down proteins and fatty acids.
23 citations
,
May 2010 in “Surface and interface analysis” Chemical treatments and UV radiation severely damage the lipid layer on hair.
October 2025 in “Coloration Technology” Delipidised wool is brighter, dyes better, and is more eco-friendly.
11 citations
,
January 2016 in “Biointerphases” The hair's outermost surface has multiple layers of lipids and proteins.
2 citations
,
October 2012 in “Experimental Dermatology” Deleting the Sox21 gene changes hair lipid composition and increases cholesterol sulfate levels.
49 citations
,
April 2010 in “International Journal of Cosmetic Science” Hair ages as the cuticle wears down, especially beyond 1 meter from the root, affecting its strength and shine.
43 citations
,
July 2005 in “Journal of Chromatography B” A new method accurately measures hair lipids, revealing individual differences.
41 citations
,
May 2005 in “International Journal of Cosmetic Science” Human hair contains various lipids that vary among individuals and help protect the hair.
August 2013 in “日本医療薬学会年会講演要旨集” Hair contains complex lipids, including cholesterol and fatty acids, similar to skin.
Water and fatty acids affect hair's surface differently based on hair damage, and models can help understand hair-cosmetic interactions.
4 citations
,
January 2021 in “Skin appendage disorders” Hair straightening can damage hair and pose health risks, including exposure to carcinogens and hair loss.
December 2025 in “Biopolymers” Heat worsens damage in chemically treated hair, especially bleached and straightened hair.
18 citations
,
August 2014 in “Lipids” Human hair has more unsaturated fats inside than on the surface, and certain lipids may help bind the outer and inner layers together.
8 citations
,
March 2018 in “Cosmetics” UV radiation damages hair by creating holes and peeling cuticle layers.
59 citations
,
January 2013 in “Annals of Dermatology” Asian hair is more resistant to UV damage due to higher lipid content.
36 citations
,
October 2014 in “Langmuir” Bleaching hair removes its protective top layer and exposes more hydrophilic groups, changing its chemical surface and affecting how it interacts with products.
28 citations
,
December 2010 in “Langmuir” Hair fibers interact through classical forces, which are influenced by treatments and products, important for hair care and other applications.
20 citations
,
January 2003 in “Journal of oleo science” Chemical treatments and daily stresses damage hair, especially the cuticle layer.
19 citations
,
January 2009 in “International review of cell and molecular biology” Hair's strength and flexibility come from its protein structure and molecular interactions.
17 citations
,
July 2019 in “Scientific reports” Surface and internal treatments can help prevent hair lipid loss during washing.
September 2023 in “Biomedicines” Squalene may be a marker for certain types of alopecia.
February 2026 in “International Journal of Molecular Sciences” PDLLA filler can improve hair thickness and shine by reducing age-related hair decline.
1 citations
,
June 2016 in “Experimental Dermatology” Metabolomics can identify hair damage markers, but its use in creating treatments is uncertain.