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Cosmetic ingredient dictionary

C11-15 Pareth-9 in cosmetics: what it is and what it does

C11-15 Pareth-9 is a cosmetic ingredient that lets oil and water mix, so the product can wash dirt away. Open Beauty Facts finds it in 15 products, most often shampoos.

By Bravoora teamUpdated Sources checked 2 sourcesHow we check

What does C11-15 Pareth-9 do in a product?

In a cosmetic product, C11-15 Pareth-9 lets oil and water mix, so the product can wash dirt away, and keeps oil and water mixed. The EU’s CosIng database lists these jobs for it: surfactant and emulsifying.

surfactantemulsifying

What other names and numbers does C11-15 Pareth-9 have?

CAS number
173244-48-9
CosIng reference
74630

Which products contain C11-15 Pareth-9?

Open Beauty Facts finds C11-15 Pareth-9 in the ingredient lists of 15 of the 22,021 products it has a list for, most often shampoos, shampoos for colored hair and hair care.

  • Shampoos1
  • Shampoos for colored hair1
  • Hair care1
  • Hair dyes1

Products with it, by country of sale: Australia 13 · France 2.

Counted on 13 October 2026 from Open Beauty Facts, which volunteers fill from real packs: it shows where C11-15 Pareth-9 turns up, not how much of the market it is.

On these listsSurfactants and cleansersEmulsifiers

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’.

  1. European Commission: CosIng cosmetic ingredient database (functions, description, EU annex entry)
  2. 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

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