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This chapter reviews hair anatomy, hair shaft structure, and various cosmetic treatments that can alter or damage hair, but it presents no new research findings.

Human hair structure varies by ethnicity, and certain treatments can improve hair condition and appearance.

This study utilized a fluorescence probe to evaluate cysteine formation on hair fibers, finding that optimal fluorescence emission occurred at pH 4.5.

This study found that applying botanical extracts improved the mechanical properties of bleached hair, reducing its permeability and increasing its crystalline content.

This review discusses the mechanisms by which sunlight exposure aggravates hair aging and highlights the role of hair pigments in providing photochemical protection, reporting no new results.

This study investigated the tensile response and morphological changes of different ethnic hair types using AFM, showing variations between virgin, chemically damaged, and conditioner-treated Caucasian hair under different conditions.

This review highlights flaxseed's potential as a natural hair care ingredient due to its moisturizing, strengthening, and nutritional qualities attributed to its high antioxidant and essential fatty acid content; however, further clinical studies are needed to optimize formulations and assess long-term effects.

This review highlights the potential of flaxseed as a natural hair care ingredient, noting its moisturizing, strengthening, and nutritional properties that may improve hair health and texture, though more clinical studies are needed to confirm these benefits.

This review highlights that flaxseed, due to its high levels of antioxidants and essential fatty acids, may improve hair texture, reduce frizz, and support hair growth, though more clinical studies are needed to confirm the best formulations and effects.

This study found that UV stabilizers must diffuse uniformly and in high uptake levels throughout hair fibers during humidification cycles to effectively prevent photo-oxidative degradation.

This study observed that individuals with mixed ethnicity had hair that varied widely in shape and showed significant surface damage near the root, differing from monoracial hair characteristics.

This study found that in cashmere goats aged 2 to 7 years, younger goats (2-4 years) produced more cashmere and had a higher population of active secondary hair follicles than older goats (5-7 years), with the latter showing greater oxidative stress.

This study demonstrates that a bioinspired peptide, PepACS, can efficiently and safely perm hair by interacting with keratin's sulfhydryl group without compromising tensile strength, and it shows potential for hair repair and dyeing applications in the hair care industry.

This analysis highlighted the importance of integrating scientific literacy into chemical hair procedures, emphasizing that understanding the interaction of chemical agents with hair's biological structure and making evidence-based decisions can improve safety, predictability, and professional standards in the beauty industry.

This study reports the development of a prototype robotic hair transplant system capable of efficiently harvesting and implanting hair grafts, showing promising accuracy and performance in tests using a spherical scalp phantom.

This review article discusses microneedling as a non-surgical treatment option in dermatology, highlighting its benefits for scar improvement through collagen induction and reporting its popularity among practitioners due to its cost-effectiveness and simplicity.

This review highlights how peripheral nerves play key roles in skin wound healing by modulating immune responses, regulating stem cell functions, and promoting vascularization, suggesting potential avenues for therapeutic strategies targeting neuroregulation.

This study found that water hardness metals like calcium and magnesium can stiffen hair fibers, reduce combing forces, and affect style retention, with varied effects on virgin and bleached hair.

The letter argues that blaming synthetic hair implants for scalp cancer based on one report is biased and possibly coincidental.

In this study using rat models, researchers developed a Pluronic@F-127 hydrogel to deliver the flavonoid pectolinarin, finding it accelerates wound healing and reduces scar formation by enhancing cell migration, proliferation, and antioxidant activity.

This study concluded that myositis in the reported case was caused by T-cell large granular lymphocytic leukemia, not dermatomyositis.

This study systematically characterized the nanomechanical properties of human hair, such as hardness and elastic modulus, across different ethnicities and treatment conditions using nanoindentation and scanning electron microscopy.

This study details how very long human hair naturally ages, showing cuticle wear and internal fiber changes that may inform new hair care product designs.

This research examined the ultrastructure of deer hair fibers and found significant variations in diameter, cuticle thickness, and intermediate filament arrangements among different fiber types.

This review covers various aspects of hair biology, pigmentation, and development, focusing on genetic and biochemical modulation of hair follicle components but reports no new findings.

This study identified a unique concentric double-layered structure in both Japanese and Caucasian SHINAYAKA hair, associated with improved flexibility and elasticity, and developed a succinic acid treatment to enhance these properties.

This study explored using tyrosine as a cross-linking agent for curling Asian hair and found that it could shape hair effectively before washing without damaging the fibers, though the method was less effective after washing compared to commercial products.

This article reviews the complexity of human hair follicles and the development of shampoos and conditioners tailored for different hair types, but it presents no new experimental findings.

This study reviewed literature on using vegetable oils to prevent skin aging, highlighting their antioxidant properties and their role in combating free radicals, which leads to extrinsic aging, while also noting Brazil's important contribution to this field with its rich natural resources.

Different methods like wigs, extensions, and devices can help improve hair volume for thinning hair.