Cosmetic ingredient dictionary
Polyquaternium-51 in cosmetics: what it is and what it does
Polyquaternium-51 is a cosmetic ingredient that keeps the skin in good condition. Open Beauty Facts finds it in 15 products, most often skincare.
By Bravoora teamUpdated Sources checked 2 sourcesHow we check
What does Polyquaternium-51 do in a product?
In a cosmetic product, Polyquaternium-51 keeps the skin in good condition and leaves a thin film on skin, hair or nails. The EU’s CosIng database lists these jobs for it: skin conditioning and film forming.
What other names and numbers does Polyquaternium-51 have?
- CAS number
- 125275-25-4
- CosIng reference
- 58830
Which products contain Polyquaternium-51?
Open Beauty Facts finds Polyquaternium-51 in the ingredient lists of 15 of the 22,021 products it has a list for, most often skincare.
Products with it, by country of sale: France 4 · United States 3 · Australia 2 · Germany 2.
Counted on 13 October 2026 from Open Beauty Facts, which volunteers fill from real packs: it shows where Polyquaternium-51 turns up, not how much of the market it is.
Bravoora reads this ingredient for everyone you shop for: an allergy or intolerance, a vegan or vegetarian diet, a calorie or protein goal, and the labels on supplements and skincare too. Build a profile · For dermatologists, dietitians and doctors
Sources
The job, the description and the EU annex entry are CosIng’s; the fragrance allergens are the EU Annex III names Bravoora’s label checker reads; the product counts are Open Beauty Facts’.
- European Commission: CosIng cosmetic ingredient database (functions, description, EU annex entry)
- Open Beauty Facts: product database, 77,506 products, read 13 October 2026, ODbL
Contains information from Open Beauty Facts, which is made available here under the Open Database License (ODbL). Read the licence · Download this dictionary’s data · How we check
Create a website profile with the things you avoid and the people you check for.
Build my profileSave and edit your profile on this website. App transfer is not available yet.