Caredermis

4-phenylbut-3-en-2-one (benzylideneacetone)

Prohibited in EU cosmetics

cosmetic ingredient

Is 4-phenylbut-3-en-2-one (benzylideneacetone) safe?

4-phenylbut-3-en-2-one (benzylideneacetone) is prohibited in cosmetic products in the EU (CosIng Annex II).

Official regulatory status

Pulled directly from official regulatory datasets and expert reviews — not our own judgement.

EU cosmetics: Prohibited

Sources

Each authority below is shown only because our ingested copy of its data lists 4-phenylbut-3-en-2-one (benzylideneacetone) — not because we asserted it. Follow a link to verify the classification or regulation directly.

See our methodology for how these map to concern levels. Informational only — not medical advice.

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