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Hair dyes penetrate the scalp very minimally, less than 1%.

This study examined how different hair dye processes affect hair structure at a molecular level, finding that oxidative dyes increase keratin porosity more than non-oxidative dyes, and highlighted emerging technology aimed at reducing hair damage while preserving color quality.

In this study, researchers investigated how different hair dye processes affect hair structure, finding that oxidative dyes disrupt hair more than semi-permanent dyes, and emerging technologies could help maintain hair health while achieving desired color.

This study reviews how different hair dyeing methods affect hair structure, showing oxidative dyes cause more structural damage than semi-permanent dyes, while new technologies aim to minimize harm while preserving color.

This study concluded that adding polymeric conditioning actives to shampoos improved color retention in permanently dyed hair, while additional cationic dyes at certain pH levels weakly dyed the hair directly.

Various skin conditions can be treated effectively with different methods, such as discontinuing certain drugs, using specific vaccines, applying creams, and changing lifestyle habits like smoking and drinking.

High blood pressure drugs often cause skin lupus, stopping the drug usually helps. A vaccine helps prevent genital herpes and HPV-16. More frequent light therapy clears psoriasis faster. No link was found between low iron and chronic hair loss.

This review covers hair dye formulations, their mechanisms, and potential applications, but reports no new findings; the authors highlight the process of oxidative dyeing and repairing damaged hair.

This study found that targeting the hair follicle can be increased by using lipophilic drugs combined with surfactant solutions and propylene glycol.

This study introduced a new method for extracting red mordant dyes from wool fibers that preserved the fibers for further analysis and allowed for spectrophotometric examination of the dyes' absorption curves.

This study found that mixtures used in permanent hair dyes had irritant effects on reconstructed human epidermis, while individual ingredients alone did not.

Avoiding dyed wigs and clothing improved severe allergic reactions in a woman treated with diphencyprone.

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 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 study describes a new method for extracting red mordant dyes from wool fibers using ethylene diamine tetraacetic acid and N,N-dimethyl formamide, preserving the fibers for further examination.

Plucked hair can help diagnose pemphigus vulgaris early.

This paper discusses advancements in forensic hair analysis, emphasizing a novel DART–HRMS method that improves the accuracy and efficiency of detecting drug use timelines.

This review discusses the use of natural products in cosmetic preparations for skin and hair care, but reports no new research results.

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

This review discusses the use of cosmetic nanocarriers to improve hair appearance and reports no new experimental results.

This study reports that a new DART-HRMS method can effectively analyze intact hair for drug use timelines, with cocaine detection aligning with forensic standards and identifying multiple drugs from high-resolution data.

This study highlights that improving medical professionals' knowledge of hair cosmetics can enhance patient adherence to alopecia treatments and reduce health risks from incorrect use of hair products.

This study suggests a potential link between hair dye exposure during periconception or pregnancy and certain adverse obstetric and pediatric outcomes, but the evidence remains preliminary and uncertain.

This study utilized advanced imaging techniques to quantify hair damage and dye uptake dynamics, revealing that compound penetration in hair is influenced by molecule size and lipophilicity.

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

This study developed and tested a shampoo with semi-permanent dyes designed to gradually cover gray hair, reporting maintained stability and effective gray–black coloration on high-canities hair tresses through eight wash cycles.

This review discusses the growing role of colorimetric sensors in food safety, highlighting their potential to enhance detection accuracy and manageability, while also noting challenges such as environmental interference and the need for further industrial validation.

This review discusses the need for an updated 'European hair cosmetic series' to include common contact allergens and remove outdated substances based on current evidence and regulations, but it reports no new results.

This study reviews recent advancements in near-infrared organic light-emitting diode (NIR OLED) technologies, focusing on their applications and the diverse luminescent materials used in their emissive layers.

This review provides a detailed analysis of frontal fibrosing alopecia, focusing on its prevalence in postmenopausal Caucasian women, associated comorbidities, and potential autoimmune, genetic, hormonal, and environmental factors; it emphasizes the need for improved understanding to enhance diagnosis and treatment.