Polyquaternium-7
Reviewed by Kate · Last updated 18 Aug 2026
Also known as: Polyquaterniums, Polyquaternium 39, Polymer
Works as a film-forming + viscosity increasing agent in skin care | Detangler and conditioning ingredient in hair care
Addresses
EWG Safety Score
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What Is Polyquaternium-7?
Polyquaternium-7 is a synthetic polymer used in skin care products as a film-forming agent and to help increase the viscosity of a formula. In hair care, it is a detangler and conditioning ingredient.
In its liquid form, it is a clear to pale yellow color.
The independent Cosmetic Ingredient Review has ruled polyquaterium-7 safe as used in cosmetics. Usage levels for polyquaternium-7 range from 0.009-5%.
Clinical Evidence & References
Published Research
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LotionCrafter, Accessed March 2023, Website [https://lotioncrafter.com/products/polyquaternium-7]
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SpecialChem, Accessed March 2023, Website [https://www.specialchem.com/cosmetics/inci-ingredients/polyquaternium-7]
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International Journal of Toxicology, October 2011, pages 73S-127S [https://journals.sagepub.com/doi/abs/10.1177/1091581811425442]
Frequently Asked Questions
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Polyquaternium-51
Synthetic polymer with a large molecular structure | Has humectant and film-forming properties for skin and hair
Polyquaternium-6
A conditioning polymer that smooths the hair fibre and reduces static
Polyquaternium-67
A conditioning polymer that forms a protective layer on hair and scalp
Polyquaternium-72
A conditioning polymer that smooths and protects hair fibre surfaces
Polyquaternium-73
A conditioning polymer that smooths and protects hair fibre surfaces
Polystyrene
A film-forming polymer with emerging safety considerations for topical use
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