The Index · Nonionic solubilizer
Isoceteth-20
Isoceteth-20
PEG-20 isocetyl ether used to solubilize oils/fragrance in aqueous serums.
FunctionalFunctional ingredient, not graded for skin benefits
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PEG-20 isocetyl ether used to solubilize oils/fragrance in aqueous serums.
What it does
Keeps clear serums homogeneous at low oil loads.
The evidence
Functional ingredient (not graded for skin benefits): PEG ether solubilizer; CIR PEG alkyl ethers context. Credible chemical identity and cosmetic-use context come from CIR/SCCS/manufacturer INCI definitions and databases such as SpecialChem/PubChem[1].
How to use it
Expect this as a supporting INCI line item unless labeled as a featured active.
What it does in the formula
Functional ingredient — not graded for skin benefits
PEG-20 isocetyl ether used to solubilize oils/fragrance in aqueous serums.[1]
Safety & limits
Source and region, always
all — Used in cosmetics within conventional leave-on/rinse-off levels; see cited safety literature.[1] CA US EU UK
Sources · 2
Numbered as cited in the text
- [1]Cosmetic Ingredient Review. PEG Alkyl Ethers. CIR (2015)regulator
- [2]SpecialChem. SpecialChem INCI profile: Isoceteth-20. SpecialChem (2024)other
Revision history
18 Sept 2026Drafted by botTheSkindex Desk