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Cosmetic ingredient dictionary

Undeceth-5 in cosmetics: what it is and what it does

Undeceth-5 is a cosmetic ingredient that lets oil and water mix, so the product can wash dirt away. Open Beauty Facts finds it in 8 products, most often shampoos.

By Bravoora teamUpdated Sources checked 2 sourcesHow we check

What does Undeceth-5 do in a product?

In a cosmetic product, Undeceth-5 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 Undeceth-5 have?

CAS number
34398-01-1
CosIng reference
80492

Which products contain Undeceth-5?

Open Beauty Facts finds Undeceth-5 in the ingredient lists of 8 of the 22,021 products it has a list for, most often shampoos, hair care and hair mousse.

  • Shampoos3
  • Hair care3
  • Hair mousse2

Products with it, by country of sale: Turkey 3 · United States 3 · United Kingdom 1 · Russia 1.

Counted on 13 October 2026 from Open Beauty Facts, which volunteers fill from real packs: it shows where Undeceth-5 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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