What function does STEARYL BETAINE serve in cosmetics?

According to the EU CosIng inventory, STEARYL BETAINE carries the following function designation(s): ANTISTATIC, CLEANSING, FOAMING, HAIR CONDITIONING, SKIN CONDITIONING, SURFACTANT - CLEANSING, SURFACTANT - FOAM BOOSTING, VISCOSITY CONTROLLING.

What other records share CAS 820-66-6?

CAS 820-66-6 may appear across multiple EU annex records. The CAS lookup page shows all Annex II–VI entries sharing this identifier, useful for identifying cross-annex regulatory status of the same chemical substance.

How do I check if my formula contains STEARYL BETAINE?

Use the INCI Checker to screen a full ingredient list across selected markets, or use the substance market comparison to review this identity across all supported market datasets.

InventoryRef 7909215/10/2010

STEARYL BETAINE

(Carboxylatomethyl)dimethyl(octadecyl)ammonium

STEARYL BETAINE is listed in the EU CosIng inventory, but no direct annex records are linked on this page yet.

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Regulatory evidence by market

No rule for this ingredient has been imported for any of the 13 markets tracked here.

That describes this inventory, not the law. No imported rule is not evidence that an ingredient is permitted: a rule may exist under another name or identifier, or in a dataset not yet imported here.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 820-66-6

CAS 820-66-6PubChem CID 101868

Stearylbetaine

The CIR Expert Panel concluded that the eleven alkyl betaines listed below are safe in the present practices of use and concentration in cosmetics, when formulated to be non-irritating...Stearyl Betaine... — Cosmetic Ingredient Review (CIR)

IUPAC name: 2-[dimethyl(octadecyl)azaniumyl]acetate

Molecular formula: C22H45NO2
Molecular weight: 355.6 g/mol
Exact mass: 355.345029678 Da
XLogP3: 9.4
Topological polar surface area: 40.1 Å²
Hydrogen-bond donors: 0
Hydrogen-bond acceptors: 2
Covalent units: 1
Defined stereocentres: 0

Also known as

Stearyl betaineN-StearylbetaineLonzaine 18SStearyldimethylbetaineStearyl dimethyl glycine(Carboxymethyl)octadecyldimethylammonium hydroxide inner salt0J4V7PZ3Q6NSC 9859

16 more reported names

NSC-9859EINECS 212-470-6NSC 36343NSC-363431-Octadecanaminium, N-(carboxymethyl)-N,N-dimethyl-, inner saltN,N-Dimethyl-N-octadecylammonioacetic acid inner saltAmmonium, (carboxymethyl)dimethyloctadecyl-, hydroxide, inner saltN-(Carboxymethyl)-N,N-dimethyl-1-octadecanaminium hydroxide, inner salt1-Octadecanaminium, N-(carboxymethyl)-N,N-dimethyl-, hydroxide, inner saltRefChem:889190STEARYL BETAINE [INCI]1-Octadecanaminium, N-(carboxymethyl)-N,N-dimethyl-, hydroxide, inner salt (9CI)(Carboxylatomethyl)dimethyl(octadecyl)ammoniumAnfoterico SB2-(dimethyl(octadecyl)ammonio)acetate1-Octadecanaminium,N-dimethyl-, hydroxide, inner salt

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

EPA DTXSID:DTXSID5061164

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Inventory details for STEARYL BETAINE

INCI name

STEARYL BETAINE

Description

(Carboxylatomethyl)dimethyl(octadecyl)ammonium

Record provenance

Inventory reference: 79092
Imported identity: STEARYL BETAINE
Source update: 15/10/2010

European Commission CosIng source notes

Annex records for STEARYL BETAINE

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Key data

CAS

820-66-6

212-470-6

Restriction

—

Function

ANTISTATIC: Preventing and/or reducing static electricity by neutralising electrical charge on surfaces.
CLEANSING: Helping to keep the body surface clean.
FOAMING: Trapping numerous small bubbles of air or other gas within a small volume of liquid by modifying the surface tension of the liquid.
HAIR CONDITIONING: Enhancing the appearance and feel of hair. Leaving the hair easy to comb, supple, soft and shiny and/or imparting volume, lightness, gloss, texture, etc.
SKIN CONDITIONING: Maintaining the skin in good condition.
SURFACTANT - CLEANSING: Wetting body surfaces, emulsifying or solubilizing oils, and suspending soil (generally, such ingredients contribute to the foaming and lathering properties of cleansing products).
SURFACTANT - FOAM BOOSTING: Increasing foaming capacity and/or stabilizing foams in general.
VISCOSITY CONTROLLING: Increasing or decreasing the viscosity (thickness) of cosmetics.

Official EU ingredient-name evidence

The ingredient name exactly matches the official 2025 EU glossary of common ingredient names.

#27833 · STEARYL BETAINE

Ingredients with overlapping formulation functions

SODIUM UNDECYLENOAMPHOACETATECLEANSING, FOAMING, HAIR CONDITIONING, SURFACTANT - CLEANSING, SURFACTANT - FOAM BOOSTING

SODIUM UNDECYLENOAMPHOPROPIONATECLEANSING, FOAMING, HAIR CONDITIONING, SURFACTANT - CLEANSING, SURFACTANT - FOAM BOOSTING

SOYAMIDOPROPYLAMINE OXIDECLEANSING, FOAMING, SURFACTANT - CLEANSING

STEARAMIDOPROPYL BETAINEANTISTATIC, CLEANSING, FOAMING, HAIR CONDITIONING, SKIN CONDITIONING, SURFACTANT - CLEANSING, VISCO…

SULFATED OLIVE OILCLEANSING, FOAMING, SURFACTANT - CLEANSING

SULFATED PEANUT OILCLEANSING, FOAMING, SURFACTANT - CLEANSING

TALLOW DIHYDROXYETHYL BETAINEANTISTATIC, CLEANSING, FOAMING, HAIR CONDITIONING, SKIN CONDITIONING, SURFACTANT - CLEANSING, VISCO…

TALLOWAMINE OXIDEANTISTATIC, CLEANSING, FOAMING, HAIR CONDITIONING, SURFACTANT - CLEANSING, SURFACTANT - EMULSIFYING…

Additional official and scientific sources

11 external databases to check this identity in

Each link searches that source for this identity. What each source is, and its legal weight

ECHA CHEM / Information on chemicals PubChem PUG REST EU Safety Gate cosmetic product alerts ECHA CHEM US EPA CompTox Cosmetic Ingredient Review safety assessments FDA Global Substance Registration System ILO/WHO International Chemical Safety Cards Japan NITE-CHRIP NIOSH Pocket Guide to Chemical Hazards OECD eChemPortal

How STEARYL BETAINE appears in the CosIng inventory

The CosIng inventory lists STEARYL BETAINE as a cosmetic ingredient and this page links it to 0 annex records. The inventory entry captures names and identifiers, while the annex records show where the substance is prohibited, restricted or positively listed in EU cosmetics law.

STEARYL BETAINE is also tagged with 8 cosmetic functions in the official data. Function labels describe intended use, but they do not replace regulatory review of linked annex records before formulation or labelling work.

Frequently asked questions

STEARYL BETAINE is listed in the EU CosIng ingredient inventory with no direct annex restriction records linked at this time. Absence of an annex link does not guarantee unrestricted use — always verify against the current official CosIng database before formulating.

According to the EU CosIng inventory, STEARYL BETAINE carries the following function designation(s):

CAS 820-66-6 may appear across multiple EU annex records. Viewing the CAS lookup page shows all Annex II–VI entries sharing this identifier, which is useful for identifying cross-annex regulatory status of the same chemical substance.

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Use the INCI Checker to screen a full ingredient list across selected markets, or compare this substance across all supported market datasets.

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Source note for STEARYL BETAINE

This page reproduces the CosIng inventory entry for STEARYL BETAINE from public European Commission cosmetic ingredient materials and shows linked identifiers even when no direct annex match is currently attached.

Use this inventory page to research STEARYL BETAINE and compare linked records, but verify restrictions and legal status against the current official source text and law before making regulatory decisions.

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