Background: Finding alternative hair dyes for individuals allergic to para-phenylenediamine (PPD) has been difficult. Newer permanent and demipermanent hair dyes that have replaced PPD with para ...

Frequent hair colouring can cause significant hair damage, scalp irritation, and hair thinning due to harsh chemicals. It is linked to long-term health issues and environmental concerns.

A chemical compound used in many permanent hair dyes has been named Allergen of the Year for 2025 by the American Contact Dermatitis Society (ACDS). Toluene-2,5-diamine sulfate (PTDS) is an ...

Citing Neal’s Yard Remedies’ hair treatment as “great for managing symptoms,” Maguire enjoys how the included rosemary, ...

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