Worth a closer look
Chemical of concern Restricted in the EU
- What it can be used for
- Forms a film on skin or hair and makes the product opaque (the functions the EU ingredient database, CosIng, lists for it; a product may use it for any of them)
- CAS number
- 27306-39-4, 25034-86-0, 25085-34-1, 9010-92-8
Why it’s flagged
Listed as a chemical of concern by the Campaign for Safe Cosmetics.
- “Styrene”. Source: Campaign for Safe Cosmetics
The Campaign for Safe Cosmetics is an advocacy group. Its profiles explain why it considers these ingredients a concern.
Allowed in EU cosmetics only with limits.
- Annex II entry 1725 bans only this form: “Styrene/Acrylates copolymer (nano) [INCI]; Sodium Styrene/Acrylates copolymer (nano) [INCI]”. Source: EU Cosmetics Regulation, Annex II (prohibited)
Annex III (restricted substances) or Annex V (preservatives) of the EU Cosmetics Regulation sets maximum amounts, allowed product types or required warnings.
What this page can’t tell you
These lists describe what a substance can do, its hazard. The risk from one product depends on how much is in it and how you use it, and the label doesn’t say how much.
Not being on a list doesn’t make an ingredient safe. It may never have been assessed.
Check your products
Check a whole labelProducts that list itEWG Skin DeepShop fragrance-free
“Products that list it” opens Open Beauty Facts, a free database anyone can edit.
Flagged the same way
Official lists checked September 2026. Spotted a mistake? Tell us.