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This review discusses the evidence for a cause-and-effect relationship between scalp condition and hair condition, and reports no new clinical results from trials.

This article reviews the components and forms of hair styling aids, their safety, and potential use in improving appearance-related hair conditions but reports no new clinical findings.

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.

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 found that sonography and electron microscopy revealed distinct abnormalities in hair follicle morphology in patients with androgenetic alopecia, which may aid in diagnosing and managing the condition.

Hair from people with seborrheic dermatitis is thicker scaled, more damaged, and thinner than healthy hair, and atomic force microscopy can help monitor the condition.

This study found that using henna dye positively affected hair cuticula pattern and diameters compared to undyed hair, though the degree of change may vary based on hair phenotype and condition prior to treatment.

In this study, BTP-loaded solid lipid nanoparticles were developed and shown to protect hair from heat-induced damage by enhancing cuticle integrity and thermal resistance in simulated thermal straightening conditions.

Hair fibers break by cuticle cell slipping, shape changing, cuticle fraying, and surface cracking when stretched under specific conditions.

This review discusses loose anagen hair syndrome, a benign and self-limited condition predominantly affecting children, and highlights the importance of differentiating it from other hair disorders like telogen effluvium and trichotillomania, but reports no new results.

This study found that the use of high pH chemical agents for hair straightening can cause significant damage to hair, including protein degradation and weakened fiber strength, and may lead to permanent scalp conditions like contact dermatitis and cicatricial alopecia.

This study found that different polypeptides, including KP peptide and hydrolyzed keratin, can improve the mechanical properties of damaged hair under varying conditions, with reduction environments and cysteine content influencing their effectiveness.

This study found that permanent dye application causes initial swelling and subsequent degradation of the hair cuticle, with recovery taking more than 8 weeks to approach pre-treatment conditions.

A Saudi girl was diagnosed with Loose Anagen Hair Syndrome, a rare condition causing easy hair loss without scarring.

In this study, incorporating a novel amino acid compound into a hair-straightening formulation improved humidity-resistant straightening and enhanced the surface and mechanical properties of hair fibers, including increased bending stiffness, reduced friction, and better shape retention under high temperature and humidity conditions.

In this study, a 3-year-old Japanese child with autosomal recessive woolly hair was found to have a distinctive irregular and rough cuticle on the hair shaft, along with a homozygous pathogenic LIPH variant, suggesting a critical role for genetic analysis in understanding rare hair conditions.

This study found that using a hair-hardener improved hair thickness, amino acid content, surface condition, tensile strength, and wave efficiency without causing any allergic reactions in participants.

In this case series, mesenchymal stem cell exosomes were reported to improve hair length, density, pigmentation, and cuticle layer recovery in three patients with acquired trichorrhexis nodosa, suggesting potential as a therapeutic approach for this hair condition.

This study observed that the Raman spectra of human hair cuticle vary with polarization and direction of signal collection, identifying certain spectral bands as markers sensitive to the structural changes in keratin secondary and tertiary structures.

This study concluded that the formulated polyherbal shampoo is a chemical-free product with nourishing, conditioning, cleansing, and antimicrobial effects.

This study found that disrupting the Sox21 gene in mice led to progressive hair loss and regrowth, identifying Sox21 as a key regulator of hair shaft cuticle differentiation.

This study found that photochemical and cosmetic chemical oxidation of hair causes surface damage by delipidation and acid formation, which can be characterized and quantified using microfluorometry and X-ray photoelectron spectroscopy.

In this study involving Japanese women, researchers found that higher scalp oil levels were linked to weaker hair structure and increased scalp inflammation, suggesting that plant-derived compounds might mitigate these effects by reducing inflammation at the genetic level.

This review discusses loose anagen hair syndrome in children, characterized by non-scarring alopecia and increased hair shedding, and reports no new results; topical minoxidil may be used as a treatment.

This study describes a microfluorometric method to quantify lipid removal and reattachment on human hair during light exposure and chemical treatments, altering hair surface properties from hydrophobic to hydrophilic.

This study found that using a high-viscosity, high-amine-content silicone fluid as a pretreatment can protect hair from bleaching and dyeing damage without affecting these processes.

This study found that CMAD wool keratin may protect human hair from damage during repeated bleaching and permanent waving treatments.

Frequent hairdryer use may worsen hair fragility in people with Pili Annulati.

This study found that Compound Diandao Pulvis Drug Facial Mask improved some signs of acne in a rabbit ear model, but its effects were not significantly different from tretinoin cream.

This study found that the hair of a 16th-century female mummy discovered in Paju was remarkably well-preserved due primarily to a calcium-based surface coating that likely inhibited moisture and microorganism infiltration.