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 ...

It's normal for kids to want to experiment with their hair color...but how early is too early to let kids dye their hair? We ...

There are a tonne of hair dyes that are free of ammonia, alcohol, and p-phenylenediamine (PPD, a chemical that helps open up your hair cuticle to let the dye in). These ingredients aren't bad or ...

The vast majority of reactions to hair-dye products are caused by PPD. [4–6] In past years, PPD was used in permanent hair dyes but not in semipermanent dyes. More recently, PPD has been used in ...