January 2026 in “Frontiers in biomedical technologies” In this study, high-resolution ultrasound imaging revealed that DHT administration in male C57BL/6 mice leads to increased epidermal and dermal thicknesses and decreased skin elasticity, simulating structural changes associated with Androgenetic Alopecia.
28 citations
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December 2011 in “Biocatalysis and biotransformation” This study found that a peptide treatment using Protein disulphide isomerase improved the mechanical and thermal properties of over-bleached hair by promoting deeper peptide penetration and attachment.
28 citations
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May 1998 in “Skin Research and Technology” This study characterized the stress-strain properties of the human scalp and found that its stiffness increases significantly with load, providing valuable insights for planning scalp surgery procedures.
25 citations
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May 2020 in “Progress in Organic Coatings” This study found that bio-based waterborne polyurethanes derived from castor oil may offer effective hair-styling performance without skin irritation and appear to be safer for the environment compared to traditional hair sprays.
13 citations
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May 2016 in “International journal of biological macromolecules” This study demonstrated that molecular dynamics simulations of keratin could effectively model the mechanical properties of hair, aligning well with experimental data, especially when conducted in vacuum conditions.
10 citations
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January 2002 in “Nihon Keshouhin Gijutsushakaishi/Journal of S C C./Nihon Keshouhin Gijutsushakai kaishi” This study found that the cuticle layer of hair contributes approximately 60% to bending stress, highlighting its significant role in the mechanical properties of hair stiffness.
6 citations
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May 2020 in “Molecules/Molecules online/Molecules annual” This study found that while yak belly hair is chemically similar to human hair, its higher porosity and lower mechanical strength limit its usefulness as a substitute in hair dye development.
4 citations
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June 2022 in “Journal of cleaner production” This study found that a new eco-friendly hair crosslinking method using visible light and non-toxic chemicals caused less damage and improved mechanical properties compared to traditional thioglycolic acid treatment.
4 citations
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October 2007 in “PubMed” This study found that the PQ-70 shampoo formulation demonstrated the highest Hair Humidity Resistance Factor, indicating superior anti-frizz performance compared to other tested shampoos.
3 citations
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June 2023 in “ACS sustainable chemistry & engineering” In this study, a method using riboflavin phosphate, citric acid, and polyols successfully optimized protein cross-linking in hair of all colors through visible light-mediated photo-cross-linking, improving the mechanical properties and hair-setting effects without the influence of hair color.
March 2026 in “ACS Applied Bio Materials” In this study, a copolymer made from Tung oil and Tung free fatty acids demonstrated improved mechanical and thermal properties for hair repair, with enhanced resistance and flexibility observed in treated bleached hair, suggesting its potential as a sustainable biopolymer for cosmetic applications.
This study observed that treating human hair with NaOH led to partially removed cuticles, resulting in better fiber cohesion and mechanical properties similar to wool, unlike bleach or formic acid treatments, which weakened the fibers.
January 2026 in “Colloids and Surfaces B Biointerfaces” This study found that treating damaged hair with maleic-modified amino silicone oil created a highly hydrophobic surface, reducing water content and improving hair's mechanical properties and thermal stability.
September 2025 in “OPAL (Open@LaTrobe) (La Trobe University)” This study developed a biobased copolymer called SELP::KP, showing improved hair strength, elasticity, and conditioning properties while being a safer alternative to conventional chemical treatments, based on application to human hair in a laboratory setting.
May 2024 in “Ultramicroscopy” Atomic Force Microscopy is a more accurate way to assess hair damage and the effect of cosmetic treatments.
July 2023 in “Nature Reviews Chemistry” A new method strengthens hair without using harmful chemicals.
February 2022 in “Fibers” This study found that a sucrose-based crosslinker can effectively straighten hair and maintain durability in high humidity and through repeated washings without affecting the hair's tensile properties or causing surface damage.
October 2021 in “Digital Library of Theses and Dissertations (Universidade de São Paulo)” This study found that applying a cosmetic active ingredient improved the Young's modulus of chemically damaged human hair fibers, suggesting enhanced mechanical properties compared to untreated fibers.
April 2018 in “Journal of Investigative Dermatology” This paper presents a new methodology combining magnetic tweezers and traction force microscopy to study keratinocyte mechanobiology, but reports no experimental results yet.
51 citations
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March 2001 in “Clinics in dermatology” This study found that bleach treatments significantly increased hair surface roughness and decreased Young's modulus, indicating marked changes in hair's molecular structure which may affect future hair-care product formulation.
11 citations
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November 2020 in “Advanced Functional Materials” This study found that a prevascularized collagen fiber space improved hair generation compared to intracutaneous transplantation by providing a better microenvironment for transplanted cells.
3 citations
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December 2021 in “Materials today communications” This study found that a keratin film made from human hair supports enhanced cell proliferation and viability compared to collagen I, suggesting potential for cell culture applications.
February 2026 in “The European Physical Journal E” This study introduced mechanical setups to analyze the mechanical properties of root hairs in Arabidopsis thaliana, finding that axial stiffness primarily relates to tip compression and turgor pressure, confirmed by independent methods adapted from work on animal cells.
August 2025 in “bioRxiv (Cold Spring Harbor Laboratory)” In this study, researchers developed innovative mechanical methods to measure the mechanical properties of Arabidopsis thaliana root hairs, concluding that axial stiffness is mainly due to tip compression and influenced by turgor pressure.
6 citations
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June 2024 in “Gels” In this study, researchers used 3D printing combined with cryogenic crosslinking to develop gelatin/oxidized alginate scaffolds and found that adding 5% hydroxyapatite improved mechanical properties and osteogenic effects, enhancing bone tissue regeneration, though 10% hydroxyapatite offered no additional osteogenic benefits and reduced shape fidelity.
2 citations
,
November 2024 in “ACS Omega” This study investigated bilayer wound dressings incorporating snail secretions into chitosan matrices, finding enhanced skin cell attachment, proliferation, and antimicrobial properties, suggesting potential for skin regeneration and wound healing.
6 citations
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March 2016 in “PLoS ONE” This study characterized hair from a patient with a ribosomopathy and identified distinct differences, including reduced hair thickness and lipid content, compared to family members.
4 citations
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November 2016 in “The Journal of Dermatology” This study found that the weak tensile strength of pili torti hair may result from loose keratin intermediate filaments due to abnormalities in disulfide bonds.
1 citations
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November 2020 in “Journal of The American Academy of Dermatology” This study found that oral spironolactone is generally well tolerated and may be effective for treating female-pattern hair loss, with improvements in hair regrowth stability as measured by Sinclair scores.
13 citations
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December 2018 in “Development, Growth & Differentiation” This study found that male and female chicken feather morphology and color patterns can be extrinsically modified through molting and resetting the stem cell niche during regeneration.