Cationic conditioning polymer. In haircare reduces static and eases combing; in skincare forms a light film.
Topical application
BLimited evidence. One RCT or several controlled studies with limitations.
Functional film-former. Well tolerated by skin and hair; allergy is very rare.
Polyquaternium-11 is a synthetic cationic polymer, a quaternary ammonium copolymer of vinylpyrrolidone and dimethylaminoethyl methacrylate. In cosmetics it functions as a film-former and hair conditioner. Manufactured by ISP under the Gafquat brand. Where applied. Hairsprays and mousses (0.5–5%), conditioners, masks, curly hair styling products. The positive charge attracts to negatively charged damaged hair surfaces, forms a thin film, reduces static, eases combing. Safety. The Cosmetic Ingredient Review (CIR) confirmed safety in 2017. Irritation potential is low. Non-comedogenic. Systemic absorption is irrelevant – the molecule is too large to penetrate the epidermis. Pregnancy and lactation – safe. Systemic absorption is minimal; no teratogenic effects reported. Possible drawbacks. Daily use can cause build-up: hair becomes stiff and dull. Solution – periodic clarifying shampoo with sulfates. In patients with scalp eczema it may cause irritation – then replaced with natural conditioners (behentrimonium, hydrolyzed proteins).
Irritation potential
LowAllergen risk
LowPregnancy
SafeSuitable for
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Polyquaternium-11 is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
Polyquaternium-11 suits: normal, dry, oily, combination, sensitive.
Cationic conditioning polymer.
The INCI name is Polyquaternium-11. It may also appear as: PQ-11.
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