Database/Emulsifying Surfactant/Ceteareth-6
Mostly petroleum · ISO 16128

Is Ceteareth-6 natural?

Mostly not. The cetearyl fatty-alcohol arm is natural; the short ethylene-oxide chain is petrochemical, giving a value very close to half.

INCI nameCeteareth-6
CAS68439-49-6
FunctionEmulsifying Surfactant · Cleansing Surfactant
FeedstockCetearyl alcohol is typically derived from coconut/palm or…

How we scored it

C16-18 alcohol avg ~256 Da (natural) + 6 EO x 44 = 264 Da (petrochemical); 256/(256+264) = 0.49, near the 0.50 boundary.
What counts. ISO 16128-2 scores the atoms that remain in the final ingredient. Reagents, solvents, catalysts and protecting groups used during manufacture leave no mass behind and are not counted.

Where it comes from

Cetearyl alcohol is typically derived from coconut/palm or tallow fatty acids, reacted with a short chain of fossil-derived ethylene oxide. The result sits right at the natural/petroleum midpoint depending on the exact cetyl:stearyl ratio used.

In plain English

An emulsifier and cleansing ingredient that helps blend oil and water. Made by reacting a blend of fatty alcohols (cetyl and stearyl, usually plant or animal derived) with a short petrochemical ethylene-oxide chain.

CosIng definition: C16-18 alcohols, ethoxylated (6 mol EO average molar ratio)

Natural alternatives with the same function

References

  1. 1ISO 16128-1:2016 and ISO 16128-2:2017 — Guidelines on technical definitions and criteria for natural and organic cosmetic ingredients and products. ISO, Geneva.
  2. 2CETEARETH-6. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  3. 3CETEARETH-6. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=CETEARETH-6