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Cosmetic ingredient dictionary

Cyclotetrasiloxane in cosmetics: what it is and what it does

Cyclotetrasiloxane is a cosmetic ingredient that softens and smooths the skin. Open Beauty Facts finds it in 12 products, most often roll-on deodorants.

By Bravoora teamUpdated Sources checked 2 sourcesHow we check

What does Cyclotetrasiloxane do in a product?

In a cosmetic product, Cyclotetrasiloxane softens and smooths the skin, keeps the skin in good condition, and makes hair easier to comb, softer or shinier. The EU’s CosIng database lists these jobs for it: emollient, skin conditioning, hair conditioning and solvent.

emollientskin conditioninghair conditioningsolvent

What other names and numbers does Cyclotetrasiloxane have?

CAS number
556-67-2, 293-51-6
EC number
209-136-7
CosIng reference
33104

Which products contain Cyclotetrasiloxane?

Open Beauty Facts finds Cyclotetrasiloxane in the ingredient lists of 12 of the 22,021 products it has a list for, most often roll-on deodorants, hair care and hair conditioners.

  • Roll-on deodorants1
  • Hair care1
  • Hair conditioners1

Products with it, by country of sale: Spain 3 · France 1 · Malaysia 1 · South Africa 1.

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

On these listsEmollients

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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