Is IRON HYDROXIDE safe to use in EU cosmetics?

IRON HYDROXIDE is listed in the EU CosIng ingredient inventory with no direct annex restriction records linked at this time. Always verify against the current official CosIng database before formulating.

What other records share CAS 20344-49-4?

CAS 20344-49-4 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 IRON HYDROXIDE?

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 3459315/10/2010

IRON HYDROXIDE

Iron hydroxide oxide

IRON HYDROXIDE 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 20344-49-4

CAS 20344-49-4PubChem CID 9793696

iron hydroxide oxide (Fe(OH)O)

Ferric oxyhydroxide is a Phosphate Binder. The mechanism of action of ferric oxyhydroxide is as a Phosphate Chelating Activity. — FDA Pharm Classes

IUPAC name: iron(3+);oxygen(2-);hydroxide

Molecular formula: FeHO2
Molecular weight: 88.85 g/mol
Exact mass: 88.932590 Da
Topological polar surface area: 2.0 Å²
Hydrogen-bond donors: 1
Hydrogen-bond acceptors: 2
Covalent units: 3
Defined stereocentres: 0

Also known as

Ferric oxyhydroxideFerric hydroxide oxideFERRIC OXY-HYDROXIDEIRON HYDROXIDE OXIDE (FEO(OH))5Fe2O3.9H2OFERRIC OXYHYDROXIDE (FEO2H)FERRIC HYDROXIDE OXIDE (FEOOH)Proferdex

10 more reported names

RefChem:791334243-746-487PZU03K0KIron hydroxide oxideiron(III) oxyhydroxideFeHO2ferric;oxygen(2-);hydroxideFERRIC HYDROXIDE [MI]IEECXTSVVFWGSE-UHFFFAOYSA-MIron(3+) hydroxide oxide (1/1/1)

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

EPA DTXSID:DTXSID3042057

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 IRON HYDROXIDE

INCI name

IRON HYDROXIDE

Description

Iron hydroxide oxide

Record provenance

Inventory reference: 34593
Imported identity: IRON HYDROXIDE
Source update: 15/10/2010

European Commission CosIng source notes

Annex records for IRON HYDROXIDE

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Key data

CAS

20344-49-4

243-746-4

Restriction

—

Function

LIGHT STABILIZER: Protecting the cosmetic product from deterioration effects of light.

Official EU ingredient-name evidence

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

#13631 · IRON HYDROXIDE

Ingredients with overlapping formulation functions

HYDROQUINONELIGHT STABILIZER

HYDROXYBUTYL METHYLCELLULOSEBINDING, EMULSION STABILISING, FILM FORMING, LIGHT STABILIZER, VISCOSITY CONTROLLING

HYDROXYCETYL PHOSPHATELIGHT STABILIZER, SURFACTANT - CLEANSING, SURFACTANT - EMULSIFYING

HYDROXYETHYLCELLULOSEBINDING, EMULSION STABILISING, FILM FORMING, LIGHT STABILIZER, VISCOSITY CONTROLLING

ISOAMYL P-METHOXYCINNAMATELIGHT STABILIZER, UV ABSORBER, UV FILTER

LACTOPEROXIDASELIGHT STABILIZER

MAGNESIUM PHOSPHATELIGHT STABILIZER

MAGNESIUM/MANGANESE/TITANIUM OXIDELIGHT STABILIZER

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 IRON HYDROXIDE appears in the CosIng inventory

The CosIng inventory lists IRON HYDROXIDE 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.

IRON HYDROXIDE is also tagged with 1 cosmetic function 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

IRON HYDROXIDE 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, IRON HYDROXIDE carries the following function designation(s):

LIGHT STABILIZER

CAS 20344-49-4 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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Source note for IRON HYDROXIDE

This page reproduces the CosIng inventory entry for IRON HYDROXIDE 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 IRON HYDROXIDE 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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