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This review discusses the psychological importance of hair and explores how various hair cosmetics can affect hair health, emphasizing that certain products can lead to acute hair problems when repeatedly altering the natural style.

This study found that coloring white facial hair is an effective and feasible adjunct to intense pulsed light therapy for hair removal, with similar efficacy between using black eyeliner and black hair dye.

This study found that hair coloring, waving, and ironing were associated with increased hair abnormalities compared to untreated hair in Iranian women.

This study demonstrated that using chelants like N , N ′ ‐ethylenediamine disuccinic acid in hair coloring products can significantly reduce keratin fiber damage by preventing the formation of metal-induced free radicals.

This case study and literature review highlights a chemical burn from hair dye experienced by a 17-year-old girl, resulting in a long-term scalp ulcer. It emphasizes the need for careful consideration of scalp complications and a multidisciplinary treatment approach in hair dye procedures.

This study established a novel in vivo "whisker follicle microinjection assay" using mouse whiskers to evaluate hair growth and pigmentation effects of various chemicals and proteins, identifying minoxidil, ruxolitinib, and RSPO1 as growth promoters, while deoxyarbutin inhibited pigmentation and Nbl1 emerged as a growth inhibitor.

In this study, a significant relationship was observed between hair coloring and both hair damage and scalp problems among students at the University of Sumatera Utara.

Hair coloring and bleaching can permanently break down hair protein and temporarily change its properties.

This study found that bleaching significantly damages hair structure and increases combing difficulty, while dyeing with emulsifiers can partially reduce damage and improve combability, yet both processes cause notable protein loss.

In this study, researchers developed a herbal mehendi gel using natural plant-based ingredients aimed at providing sustainable hair coloring and scalp care. The formulation demonstrated beneficial properties including natural hair coloring, scalp conditioning, antimicrobial activity, antioxidant action, and safety with no observed skin irritancy.

This review discusses the harmful effects of coloring shampoos containing trihydroxybenzene on the scalp-skin barrier and emphasizes the need for safer ingredient selection to prevent side effects.

In this study, the herbal hair colorant formulation HD-3, with a mix of specific herbs, was most effective at coloring hair and highly accepted by volunteers.

In this article, the authors describe how hair coloring in 2026 has transformed into a sophisticated, scientifically precise process involving advanced techniques, pre-treatment diagnostics, and careful chemical management for safe application.

In this study, a herbal hair dye was formulated and tested, showing good stability and quality. The addition of Barleria prionitis flower enhanced color intensity and conditioning effects, suggesting it as a safe and effective natural alternative to chemical dyes.

In this study, researchers formulated a herbal hair dye with natural ingredients, including Barleria prionitis, and found it to be stable, effective, and a promising natural alternative to chemical dyes, enhancing color intensity and hair conditioning compared to formulations without this component.

This study evaluated a herbal mehendi gel formulated for natural hair coloring and scalp care, finding it safe for topical use and demonstrating benefits like natural coloring and scalp conditioning.

This study explains the formulation and evaluation of a natural polyherbal shampoo, which effectively colors hair and provides conditioning without the dermal and systemic toxicity risks of synthetic dyes, offering an effective alternative to conventional products.

This study observed that combining hair dyeing with sodium hydroxide relaxers drastically increased protein loss in Caucasian virgin dark brown hair, while ammonium thioglycolate or guanidine hydroxide relaxers caused less damage.

This case report describes a young man who suffered from secondary cicatrical alopecia due to a steam cap burn at a hair salon, with no improvement after 13 months of various treatments until surgical excision.

This article discusses hair care practices and hair cosmetics in managing alopecia but reports no new clinical findings; it emphasizes the importance of scalp health and good patient-physician communication.

This article explores the theoretical foundations of the ChromaLens Precision Mapping system for analyzing hair, but it does not present any new experimental findings.

This review examines the pathogenesis of premature hair graying and potential treatment avenues, but reports no new experimental outcomes, highlighting ongoing research challenges and hopes for drug development.

This article reviews innovations in hair cosmetics, focusing on esthetic procedures and products in the Indian market, and reports no new experimental findings.

This paper suggests that coating hair with drug-loaded nanotubes may offer durable drug delivery and color applications, with potential for both human and veterinary uses.

This article recommends creating a system to educate users about the ingredients and side effects of hair coloring products and does not report new research findings.

This study found that individuals who perceive their hair health as poor tend to have higher levels of metals on their hair, emphasizing the impact of environmental metal exposure.

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 case report details an instance of acute kidney injury following the inhalation of hair dye during a hairstyle session.

In this study, researchers highlighted that while hair lipids are crucial for hair health and protection, surfactants in shampoos and conditioners can partially remove these lipids, potentially affecting hair structure, though the exact mechanisms remain poorly understood and require further investigation.