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Polyquaternium-39

Forms a light film.

What it is

A lab-made polymer, a long-chain molecule, that carries a positive charge.

Forms a thin film on hair or skin and reduces static.

A short summary from the dictionary, not yet an in-depth article. About these entries

What it does in a formula

Forms a light filmOfficial EU function: Film forming
Reduces staticOfficial EU function: Antistatic

What official sources say

Restricted in certain uses · Cosmetics, EU

Allowed in EU cosmetics only within set limits and conditions (Annex III, entry 66).

Regulation (EC) No 1223/2009, Annex III: list of substances which cosmetic products must not contain except subject to the restrictions laid down, retrieved 2026-10-09

A label gives no amounts, so none of this says a product is unsafe.