April 2021 in “Han'gug miyong haghoeji/Journal of the Korean society of cosmetology” Eating raw cheonggukjang improves scalp hair in middle-aged women.
Hair can't be as strong as Rapunzel's because it's impractical to scale up due to defects.
March 2016 in “The Korean Society of Beauty and Art” MSG-based hair hardener improves hair thickness, strength, and wave retention after perms.
September 2014 in “Daehan miyong hakoeji” Adding 2% glycerin or hyaluronic acid to permanent wave treatments reduces hair damage, with hyaluronic acid being more effective.
January 2012 in “Jounal of The Korean Society of cosmetology” Applying conditioner mid-treatment reduces hair damage during perms.
Hair coloring and bleaching can permanently break down hair protein and temporarily change its properties.
March 2005 in “Journal of the American Academy of Dermatology” Adding amino acids to damaged hair can improve its strength and appearance.
Anti-keratin antibody from cow milk makes damaged hair stronger and less likely to break.
September 2025 in “International Journal of Cosmetic Science” Friction causes hair breakage during combing, and fragment count predicts hair strength.
December 2023 in “Data in Brief” Curly hair's strength and flexibility vary with moisture and temperature.
1 citations
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December 2022 in “Journal of applied biological chemistry” TRP-hair essence protects hair from heat damage, maintains color, and strengthens hair.
December 2025 in “Sustainable Chemistry One World” Mangosteen waste can be used as an eco-friendly natural hair dye, producing a lasting reddish color and strengthening hair.
January 2025 in “International Journal of Cosmetic Science” Citric acid strengthens and improves damaged hair.
October 2012 in “Advanced Materials Research” Higher temperatures improve rabbit hair strength up to 50°C, but moisture weakens it.
NaOH treatment improves hair strength and suitability for textiles.
45 citations
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December 2006 in “Biopolymers” Permanent waving weakens hair by altering its protein structure.
February 2025 in “Brazilian Journal of Hair Health” The Brazilian candle flame technique can damage hair by melting the cuticle and exposing the cortex.
May 2009 in “International Journal of Cosmetic Science” Permanent waving damages hair protein and weakens hair, especially with repeated treatments using sodium thioglycolate.
42 citations
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April 2008 in “Acta materialia” Different ethnicities and treatments affect human hair strength and structure.
1 citations
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April 2021 in “Han'gug miyong haghoeji/Journal of the Korean society of cosmetology” Aspartic acid at 0.75% makes perms more effective and less damaging to hair.
December 2025 in “Cosmetics” The bio-based complex effectively repairs and protects chemically damaged hair.
13 citations
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January 1995 in “Journal of the American Institute for Conservation” Researchers developed a less damaging way to extract red dyes from wool using EDTA and DMF, preserving the fiber's strength for further analysis.
3 citations
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August 2008 in “PubMed” Repeated digital perming with sodium thioglycolate lotion significantly damages hair protein and structure.
January 2023 in “SSRN Electronic Journal” The fibroin-based formulation strengthens and repairs chemically damaged hair.
November 2022 in “International journal of trichology” Glyoxylic acid straighteners cause more protein loss but have similar hair strength effects as traditional alkaline straighteners.
December 2022 in “Cosmetics” The food supplement improved hair growth and strength in people with a certain type of hair loss and had no major side effects.
January 2020 in “한국미용학회지” Musa extracts protect hair from damage during chemical treatments.
36 citations
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April 2013 in “Cell and Tissue Research” Bone-marrow and epidermal stem cells help heal wounds differently, with bone-marrow cells aiding in blood vessel formation and epidermal cells in hair growth.
Micro-needling with growth factors and minoxidil improved hair growth in a balding man.
Taking enzyme food and collagen together improves hair health in middle-aged women more than taking them separately.