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This study found no evidence that the tested hair dye ingredients undergo hepatic metabolism to reactive oxidized metabolites in human liver microsomes and hepatocytes.

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discusses the need for an updated 'European hair cosmetic series' to include common contact allergens and remove outdated substances based on current evidence and regulations, but it reports no new results.

In this study, patients with scalp seborrheic dermatitis exhibited distinct patterns of allergen sensitization tied to symptoms, impaired skin barrier, and altered microbiota, emphasizing the need to consider allergen exposure, barrier status, and microbial balance when interpreting patch test results.

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 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.