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January 2017 in “Ancient science of life/Ancient Science of Life” This study reported that Vatika Enriched Coconut Hair Oil was safe and more effective than regular coconut oil in reducing hair fall, controlling dandruff, and enhancing hair condition, such as shininess and tensile strength, in women over an 8-week period with no adverse effects.
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February 2004 in “Dermatologic Surgery” This study found that using deep plane fixation during scalp surgeries significantly reduced closure tension and allowed for increased tissue excision compared to standard techniques without fixation.
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January 1988 This study found that hair treatments applied after chlorination, especially bleaching and dyeing, more significantly altered surface properties and weight loss, while perming most strongly affected tensile properties.
August 2026 in “Journal of the Korean Society of Cosmetology” In this study, researchers observed that Sedum takesimense extract improved the surface properties, moisture retention, tensile strength, and wave formation of damaged hair compared to a water control, even after additional chemical and UV damage, suggesting its potential as a protective hair treatment.
July 2026 in “Clinical Cosmetic and Investigational Dermatology” In this study, a liposomal-encapsulated Sesbania grandiflora formulation significantly improved hair and scalp health in adults with hair loss over 180 days, showing enhanced hair density, thickness, growth rate, and tensile strength compared to placebo, with no related adverse events reported.
July 2026 in “DOAJ (DOAJ: Directory of Open Access Journals)” This study found that the liposomal Sesbania grandiflora formulation significantly improved hair and scalp health in adults with hair loss compared to placebo over 180 days, enhancing factors such as hair density, thickness, growth rate, and tensile strength, with no related adverse events reported.
This study proposed a new standardized in vitro framework using human hair tresses to evaluate cosmetic hair product performance and found significant improvements in hair breakage, tensile strength, shine, volume, and frizz control compared to a control group without such changes.
May 2026 in “Materials Today Bio” This study reported that a bioderived melanoidin/tannic acid nanocomplex forms a durable, antioxidant-active coating on hair fibers, providing enhanced UV protection and improving tensile resilience by suppressing oxidative stress and activating endogenous antioxidant pathways.
March 2026 in “Cosmetics” In this comprehensive review, researchers reported that macromolecules like type I collagen, keratin, and ceramides enhance hair health by improving follicular function and increasing hair density, strength, shine, and resilience, as shown in various in vitro, animal, and human studies.
In this 24-week study, oral supplementation with hydrolyzed low-molecular-weight porcine placental peptides significantly improved scalp elasticity, hair diameter, tensile strength, surface roughness, and luster compared to placebo, suggesting its potential as a nutritional intervention for age-related scalp and hair changes.
February 2026 in “Journal of the Korean Society of Cosmetology” This study found that the viscosity of silicone oil in hair treatments significantly affects wave curling performance and hair damage, with untreated and chemically treated hair showing different optimal viscosities.
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 “International Journal of Peptide Research and Therapeutics” In this study, adults with mild-to-moderate hair damage taking GPVGPS Collagen® daily for 24 weeks showed significant improvements in hair luster, strength, thickness, and density compared to placebo, with no safety concerns reported.
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.
January 2026 in “Biomedical and Biopharmaceutical Research” This study found that formulations containing pequi and buriti oils improved texture properties and significantly increased gloss in curly hair, with pequi oil also significantly enhancing tensile strength.
January 2026 in “Brazilian Journal of Pharmaceutical Sciences” This study assessed the effects of chemical treatments on hair fiber integrity and found that conditioners with vegetable oils like jojoba and coconut enhanced hydrophobicity and reduced combing friction except for jojoba, while participants preferred these oil-containing conditioners over the base formulation.
December 2025 in “Sustainable Chemistry One World” In this study, researchers found that mangosteen pericarp extract, combined with FeSO₄ as a mordant, effectively produced a stable reddish hair dye on bleached hair, with good color persistence and enhanced tensile strength, indicating its potential as an eco-friendly and safer alternative to synthetic dyes.
December 2025 in “Cosmetics” In a laboratory study, researchers found that a novel Bioactive Crosslink Repair Complex improved both the protection and repair of chemically damaged hair, enhancing tensile strength, shine, and cuticle alignment when added to bleaching mixtures and leave-in conditioners.
December 2025 in “Asian Journal of Beauty and Cosmetology” This study found that applying soybean oil extract to damaged hair significantly improved brightness, tensile strength, absorbance, and gloss, suggesting its potential in enhancing hair condition. Further research is needed to explore how different natural extracts affect damaged hair.
December 2025 in “The American Journal of Medical Sciences and Pharmaceutical Research” This study outlines how combined ultrasonic and infrared hair treatments may enhance hair restoration and performance by breaking down keratin disulfide bonds for better treatment access and sealing cuticle scales to preserve improvements, with potential applications in salon and home settings.
October 2025 in “Journal of the Korean Society of Cosmetology” This study found that applying a hair mist with dandelion extract before heat perming improved wave efficiency, tensile strength, and hair cuticle condition compared to a base mist or no pretreatment, demonstrating the extract's protective effects against heat damage.
September 2025 in “International Journal of Cosmetic Science” This study found that for straight hair, friction mainly influences fragment formation during combing, suggesting no direct connection to tensile fatigue failure, while with textured hair, combing performance may be more complex.
May 2025 in “Research Journal of Biotechnology” This study found that diabetic individuals experienced significant changes in hair characteristics, including reduced thickness, strength, and altered growth cycle phases, correlated with poor glycaemic control and haematological variations compared to healthy controls.
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.
February 2025 in “Brazilian Journal of Hair Health” This study reports that the candle flame technique "velaterapia," popular in Brazil for addressing split ends, can damage hair fibers due to bubble formation at high temperatures, despite thermal protectors providing some cuticle protection.
January 2025 in “International Journal of Cosmetic Science” This study found that citric acid treatment can significantly improve the structural integrity and mechanical properties of chemically treated hair, reducing damage by increasing keratin crosslinking density and decreasing crystallized calcium soaps, with varying effectiveness depending on the type of chemical treatment.
September 2024 in “Heliyon” In this study, researchers observed that even a single session of hair dyeing can damage hair fibers, with significant worsening of mechanical properties and protein composition after three or more consecutive treatments, emphasizing the need to consider the cumulative impacts of dyeing on hair health.
August 2024 in “Journal of the Korean Society of Cosmetology” The research reported that applying treatments with wild peach leaf extract during hair dyeing improved hair's tensile strength, thickness, gloss, and protective qualities in a concentration-dependent manner, suggesting potential for use in natural hair cosmetics.
August 2024 in “Cosmetics” In this study, a bleaching protocol was developed to evaluate hair repair products, revealing that K18® and Olaplex® improve hair brightness and lightness, with distinct impacts on hair fiber properties.
January 2024 in “International Journal of Cosmetic Science” This study found that 1,4-n-butylene dimaleate can restore the mechanical properties of reduced hair by reconnecting disulfide bonds and improving the hair's structural integrity using a thiol-Michael click reaction, compared to untreated reduced hair.