Database/Cleansing/Laneth-25
Mostly petroleum · ISO 16128

Is Laneth-25 natural?

Mostly not. Same lanolin-alcohol/ethylene-oxide split as other Laneths, at a higher ethoxylation degree than Laneth-15.

INCI nameLaneth-25
CAS61791-20-6
FunctionCleansing · Emulsifying Surfactant
FeedstockLanolin alcohols are ethoxylated with petrochemical ethylene oxide…

How we scored it

Lanolin alcohol ~350 Da (natural) + 25 EO x 44.05 = 1101.25 Da (petrochemical) = 350/1451.25 = 0.24
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

Lanolin alcohols are ethoxylated with petrochemical ethylene oxide at a higher degree than Laneth-15. No natural alternative to the ethylene oxide exists.

In plain English

A cleansing and emulsifying ingredient made from lanolin (wool grease) reacted with a substantial amount of petrochemical ethylene oxide.

CosIng definition: Alcohols, lanolin, ethoxylated

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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. 2LANETH-25. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  3. 3LANETH-25. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=LANETH-25