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Cosmetic ingredient dictionary

Isostearic Acid in cosmetics: what it is and what it does

Isostearic Acid is a cosmetic ingredient that lets oil and water mix, so the product can wash dirt away. Open Beauty Facts finds it in 32 products, most often sunscreen.

By Bravoora teamUpdated Sources checked 2 sourcesHow we check

What does Isostearic Acid do in a product?

In a cosmetic product, Isostearic Acid lets oil and water mix, so the product can wash dirt away, cleans the skin, hair or teeth, and keeps oil and water mixed. The EU’s CosIng database lists these jobs for it: surfactant, cleansing, emulsifying and binding.

surfactantcleansingemulsifyingbinding

What other names and numbers does Isostearic Acid have?

CAS number
30399-84-9, 2724-58-5
EC number
250-178-0
CosIng reference
77840

Which products contain Isostearic Acid?

Open Beauty Facts finds Isostearic Acid in the ingredient lists of 32 of the 22,021 products it has a list for, most often sunscreen, face makeup and bb creams.

  • Sunscreen3
  • Face makeup2
  • Bb creams1
  • Eye makeup1
  • Mascara1

Products with it, by country of sale: Norway 8 · United States 5 · France 4 · Australia 3.

Counted on 13 October 2026 from Open Beauty Facts, which volunteers fill from real packs: it shows where Isostearic Acid 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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