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Quick answer: Hydroquinone carries the heavier risk profile. Dioxane (1,4-dioxane) is restricted in the EU and allowed in the US; Hydroquinone is banned in the EU and allowed in the US.
| Property | Dioxane (1,4-dioxane) | Hydroquinone |
|---|---|---|
| EU status | Restricted | Banned |
| US status | Allowed | Allowed |
| Risk level | high | high |
| Banned in | — | European Union |
| Restricted in | European Union | — |
| Category | cmr | cmr |
| Where it hides | shampoo (contaminant), body wash, bubble bath | skin-lightening cream, dark-spot corrector |
Dioxane (1,4-dioxane) (1,4-Dioxane) is a manufacturing byproduct contaminant.
Hydroquinone is a skin-lightening agent that inhibits melanin production.
Dioxane (1,4-dioxane): A probable carcinogen; the EU limits it as a trace impurity, and US states are beginning to cap it.
Hydroquinone: Linked to ochronosis and possible carcinogenicity. Banned in EU cosmetics; sold over-the-counter in the US up to 2%.
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