There’s nothing pretty about this. A watchdog group tested more than 20 top-selling at-home hair dyes and found toxic chemicals across the board — including a substance classified as a probable human ...

Current estimates suggest that 50-80% of women and 10% of men 40 years of age and over in the United States and Europe use permanent hair dye products. The aromatic amine p-phenylenediamine (PPD) is ...