The ingredient, explained
Peg-100 Stearate
Peg-100 Stearate has published research relevant to cosmetic safety assessment.
Ingredient guide
What it is and what it does
PEG-100 stearate is a stearic-acid-derived ingredient with a recorded surfactant role. Surfactants help formulas distribute and interact with components that would otherwise mix poorly.
About this ingredient: CosIng identity and functions via Open Beauty Facts ↗ · European Commission ingredient function definitions ↗
- Surfactant
- Changes surface tension to help a product distribute or interact with other materials.
Function definitions: European Commission ingredient function definitions (SCCNFP/0299/00, pages 16 to 20) ↗
Registry functions describe possible formulation roles, not results for a finished product. A dictionary entry is not an approval or a safety assessment.
A closer look
What the research shows
Safety assessment
The report reviews animal toxicology and clinical irritation and sensitization testing of the listed PEG stearates, with a conclusion limited to the concentrations and uses assessed.
What this does not tell us
Historical group safety review with read-across. It does not establish a skin benefit or guarantee tolerance in every formulation.
Sources for this summary. DOI 10.3109/10915818309142000 ↗
Research review checked Oct 1, 2026
Selective exact-identity review of 0 supplied local candidates and the targeted primary-source search recorded below. Bounded review, not a systematic search.
Ingredient research is not proof that a product containing this ingredient works.
Read the 1 selected study
Follow the formula
Products containing this ingredient
From the Serenfold edit. Linked by the ingredient list, without an efficacy ranking.
Names and identifiers
Registry identity
Poly-oxy-1‚2-ethanediyl-, .alpha.--1-oxooctadecyl--.omega.-hydroxy- -100 mol EO average molar ratio-
- INCI name on ingredient lists
- PEG-100 STEARATE
- CAS registry number
- 9004-99-3
Sources for this ingredient record
- EU CosIng ingredient registry (via Open Beauty Facts taxonomy) ↗ · ODbL 1.0 (Open Beauty Facts database) · Recorded Aug 8, 2026
- European Commission ingredient function definitions ↗ · Recorded Sep 30, 2026