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Quick answer: p-Phenylenediamine carries the heavier risk profile. p-Phenylenediamine is restricted in the EU and allowed in the US; Selenium sulfide is restricted in the EU and allowed in the US.
| Property | p-Phenylenediamine | Selenium sulfide |
|---|---|---|
| EU status | Restricted | Restricted |
| US status | Allowed | Allowed |
| Risk level | high | medium |
| Banned in | — | — |
| Restricted in | European Union | European Union |
| Category | cmr | cmr |
| Where it hides | permanent hair dye, black henna tattoos | anti-dandruff shampoo |
p-Phenylenediamine is a primary intermediate in permanent hair dye.
Selenium sulfide (Selenium Sulfide) is an antifungal dandruff active.
p-Phenylenediamine: A potent allergen and sensitizer. Strictly concentration-limited in the EU; less tightly controlled in the US.
Selenium sulfide: Restricted in the EU; a US OTC dandruff active with limited oversight.
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