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This review discusses the dermatological and systemic adverse effects of hair dye use, particularly focusing on the common allergen para-phenylenediamine, and reports no new clinical data.

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

This study found that the majority of "hypoallergenic" hair dyes still triggered allergic reactions in patients sensitive to para-phenylenediamine.

This study suggests that using cholesterol-free liposomes, specifically PPD-Lip, as a delivery system with dutasteride may enhance the treatment of androgenetic alopecia by promoting hair regrowth in mice models.

In this study, an ammonia-free and PPD-free permanent hair dye was tested on 50 ethnically diverse females, showing no cases of contact dermatitis and significant improvements in hair shine, color, moisturization, porosity, and combability after two dyeing sessions.

This study found that para-phenylenediamine induces cytotoxic effects in normal human hair dermal papilla cells by altering microRNA expression and causing cell death, cell cycle arrest, and oxidative stress.

In their review, the authors discussed the increasing issue of allergies to hair products, highlighting common allergens such as hair dyes and topical minoxidil, and outlined diagnostic methods and alternatives for those affected, particularly addressing higher risks among hairdressers due to professional exposure.

In this literature review, potential health risks of toxic chemicals commonly found in cosmetic products were linked to issues such as cancer, reproductive abnormalities, and skin diseases, highlighting concerns over ingredients like talc, parabens, and phthalates.

This observational study reports a striking correlation between the use of henna hair dye and a specific pattern of hair loss, termed "hennapecia," but calls for experimental research to determine causality.

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

This study reviews the transformative role of artificial intelligence in biomaterial design, highlighting its ability to reduce costs through virtual screening, enhance material performance, and predict biological interactions to advance personalized and precision medicine.

Hair care products are important for appearance and self-esteem, and choosing the right ones can help maintain healthy hair.

This study found that a non-ionic ethosomal carrier system significantly improved the delivery and adsorption of black tea extracts onto hair surfaces in vitro, suggesting its potential as a hair dye and protective agent.

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 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 report details a case study where a 40-year-old woman experienced allergic contact dermatitis and angioedema-like symptoms after using PPD-containing hair dye. Patch testing confirmed a positive reaction to PPD, highlighting the substance's potential to cause both T-cell and IgE-mediated hypersensitivity reactions.

This review highlights a case of cross sensitization to dyes from temporary henna tattoos and stresses the need for public awareness on the risks associated with these tattoos.

This study introduced an eco-friendly enzymatic hair dyeing process utilizing laccase-catalyzed polymerization of hematoxylin, achieving intense, long-lasting color comparable to commercial dyes while enhancing hair strength and offering antioxidant and UV-shielding benefits.

In this study, polydopamine emerged as a safe and effective alternative to traditional hair dyes like PPD for dyeing gray hair permanently, showing resistance to detergents and causing less toxicity and hair loss in mice.

This study found that PPD-Lip@RES may effectively promote hair growth in models of telogen effluvium and androgenetic alopecia, suggesting its potential as a promising treatment strategy by addressing the underlying pathological and physiological processes of hair loss.

This study suggests that bio-nanovesicles, such as exosomes and microvesicles, may enhance skin and hair follicle regeneration by modulating key signaling pathways, potentially overcoming the limitations of conventional treatments for alopecia and chronic skin diseases.

This study found that ultraviolet radiation negatively affects hair follicle functions in human scalp skin, and caffeine application may provide some protective effects against this damage.

This review discusses the components and effects of various hair cosmetic procedures and explores new techniques like camouflage methods and tattoo scalp, without reporting new clinical results.

This review synthesizes research on solar radiation's multifaceted effects on skin and recent advancements in sunscreen technology, including formulation, testing methods, and the use of AI, to inform future sun protection product development.

This review highlights the potential of nanotechnology-based formulations in hair care and treatment, emphasizing how these innovative materials can enhance the stability, efficacy, and safety of active compounds while addressing the limitations of conventional formulations.

This study developed a natural hair dye using Coreopsis tinctoria Nutt. extract, finding that it produced yellow to dark brown colors depending on the treatment, with ferrous lactate enhancing dye performance and color stability after washing.

This review discusses the pharmacology and potential therapeutic effects of rare ginsenoside compound K on metabolic disorders but presents no new clinical results, highlighting the need for further studies on its bioavailability and toxicity.

This article reviews current understanding of frontal fibrosing alopecia and lichen planopilaris, highlighting increasing incidence and unclear pathogenesis, and emphasizes the role of inflammatory destruction of hair follicular stem cells; it reports no new clinical findings.

This review discusses transdermal drug delivery using hydrogel-forming microneedles and highlights their potential for disease treatment, but notes challenges in their clinical application.

This review highlights the lack of research on Afro-textured hair, emphasizing the need for better understanding of its genetic traits and molecular structure to develop more effective hair care solutions.