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The book "Diseases of the Hair and Scalp" has outdated information and confusing content, but may still offer some insights.

Treatments for hair loss vary, but cell-based options may be the future.

This review examines the direct-to-consumer genetic testing market, highlighting the available tests, regulatory issues, and calls for increased oversight, and reports no new results.

This review covers the history, incidence, and treatment options for pseudofolliculitis barbae and presents new data, but reports no new clinical results.

This study found that human hair can be classified into eight main types based on objective measurements of shape, rather than ethnic categories, enhancing the understanding of hair diversity globally.

This review discusses laser/light treatments for pattern hair loss and reports no clinical validation of current devices; experts recommend physician evaluation to exclude other medical conditions.

This review discusses the various skin manifestations associated with end-stage renal disease and their potential causes but reports no new clinical findings; the authors emphasize pruritus as a significant condition.

This study found that in naturally curved human scalp hairs, distinct arrangements of cell types on either side of the hair fiber contribute to its curvature.

This article reviews the potential mechanisms underlying polycystic ovary syndrome, emphasizing insulin resistance and hormone dysregulation, and reports no new research findings.

This review discusses the potential therapeutic effects of targeting the endocannabinoid system for chemotherapy-induced peripheral neuropathy and reports no new clinical results, highlighting the need for ongoing research.

This study introduces the multiple papillary centres model, offering a new explanation for hair twisting by combining known hair morphology features with differential growth rates caused by dermal papillae.

This study found that hair curvature in merino wool is influenced by differences in cell type length rather than the proportions of orthocortical and paracortical cells.

In this study, electrical stimuli at low voltage and frequency settings promoted hair growth in vitro and in rabbit models, possibly by activating pathways like Wnt/β-catenin.

This study identified and updated the annotation of 61 keratin genes in dogs and horses, improving the genome annotation in these species through RNA-seq data comparison.

This review highlights the pharmaceutical potential of secondary metabolites from Juniperus species, noting promising antitumor, antibacterial, and antiviral activities, but reports no new experimental findings.

In this study, the first case of a persistent curly hair phenotype was reported with nivolumab treatment in a patient with metastatic squamous cell lung cancer.

This case report describes repigmentation and curling of hair in a patient undergoing acitretin therapy.

This study found that micro-current electrical stimulation may promote hair growth in human hair follicle-derived papilla cells and a mice model by enhancing cell proliferation, migration, and activating key growth pathways.

This small study reports that a 6-group geometric classification method is more reliable for classifying human hair curl, although a digital system could further reduce errors.

A woman developed white patches on her skin and curly hair after hepatitis C treatment, likely due to the medication interferon alpha.

This study found that sodium metabisulfite activates sodium channels and increases cellular excitability and excitotoxicity in both cardiomyocyte and neuron models, which exacerbates seizures and neuronal damage in rats.

This study examined hair curvature in Japanese women, finding that 47% have curved hair, and identified structural differences in hair fiber, which resemble those in wool fibers.

This review evaluates various biopsy protocols for alopecia diagnosis and discusses the authors' experience with the St John's protocol but presents no new clinical findings.

In this review, researchers summarize the methods for characterizing telocytes, outline their physiological roles and implications in diseases, and discuss potential future studies including precise markers and targeted therapies.

This study used single-cell RNA sequencing to map the cellular composition of sheep hair follicles, revealing differentiation pathways and potential molecular mechanisms for wool curvature, which may inform sheep breeding.

This study reports a good correlation between the curvature of human eyelashes and the displacement of the neutral axis, influenced by the non-uniform thickness of the outer cuticle layer.

This study suggests that male sex and androgenic steroid use increase the risk of atrial arrhythmias in individuals with arrhythmogenic right ventricular cardiomyopathy, especially those with desmosomal gene mutations.

Merino wool fibers change shape with moisture, while human hair shape stays the same.

In this randomized controlled trial, oral intake of the probiotic Latilactobacillus curvatus LB-P9 significantly improved hair luster, elasticity, and participant satisfaction in individuals with mild to moderate hair damage compared to placebo, without significant adverse effects reported.

This article reviews the limitations in current research on photobiomodulation for hair regrowth and suggests that optimal wavelengths and dosing have not yet been identified, noting that recommending these devices may be premature.