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CAS 617-73-2 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.

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InventoryRef 3448415/10/2010

HYDROXYCAPRYLIC ACID

dl-2-Hydroxyoctanoic acid

HYDROXYCAPRYLIC ACID 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.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 617-73-2

CAS 617-73-2PubChem CID 94180

Hydroxycaprylic Acid

2-hydroxyoctanoic acid is a hydroxy fatty acid that is caprylic (octanoic) acid substituted by a hydroxy group at position 2. It is functionally related to an octanoic acid. It is a conjugate acid of a 2-hydroxyoctanoate. — ChEBI

IUPAC name: 2-hydroxyoctanoic acid

Molecular formula: C8H16O3
Molecular weight: 160.21 g/mol
Exact mass: 160.109944368 Da
XLogP3: 2.0
Topological polar surface area: 57.5 Å²
Hydrogen-bond donors: 2
Hydrogen-bond acceptors: 3
Covalent units: 1
Defined stereocentres: 0

Also known as

2-Hydroxycaprylic acidOctanoic acid, 2-hydroxy-alpha-Hydroxycaprylic acidalpha-Hydroxyoctanoic acidDL-2-Hydroxyoctanoic acidDL-2-Hydroxycaprylic acid.alpha.-Hydroxycaprylic acid0R6X0G0S8A

16 more reported names

.alpha.-Hydroxy-n-caprylic acidEINECS 210-524-3NSC 189703NSC-189703alpha-Hydroxy-n-caprylic acidCHEBI:86543alpha-HCA acidRefChem:789453HYDROXYCAPRYLIC ACID [INCI](+-)-2-HYDROXYOCTANOIC ACID(+-)-ALPHA-HYDROXYCAPRYLIC ACID(+-)-.ALPHA.-HYDROXYCAPRYLIC ACID210-524-32-Hydroxy-n-octanoic Acid2-hydroxy caprylic acid2-hydroxy-octanoic acid

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEBI:CHEBI:86543
ChEMBL:CHEMBL4447980
EPA DTXSID:DTXSID80862300
PubMed:22654812
PubMed:21820511
PubMed:21255122
PubMed:20496346
PubMed:19561068
PubMed:19493341
PubMed:19465768
PubMed:18215067
PubMed:16958050
PubMed:15260495
PubMed:14584912
PubMed:12053206

Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Inventory details for HYDROXYCAPRYLIC ACID

INCI name

HYDROXYCAPRYLIC ACID

Description

dl-2-Hydroxyoctanoic acid

Record provenance

Inventory reference: 34484
Imported identity: HYDROXYCAPRYLIC ACID
Source update: 15/10/2010

European Commission CosIng source notes

Annex records for HYDROXYCAPRYLIC ACID

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Key data

CAS

617-73-2

210-524-3

Restriction

—

Function

SKIN CONDITIONING: Maintaining the skin in good condition.

Official EU ingredient-name evidence

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

#13204 · HYDROXYCAPRYLIC ACID

Ingredients with overlapping formulation functions

HYDROXYBENZYL ALCOHOLSKIN CONDITIONING

HYDROXYBUTYRIC ACID/HYDROXYPENTANOIC ACID COPOLYMERABRASIVE, SKIN CONDITIONING, VISCOSITY CONTROLLING

HYDROXYCAPRIC ACIDSKIN CONDITIONING

HYDROXYCAPROYL PHYTOSPHINGOSINEHAIR CONDITIONING, SKIN CONDITIONING

HYDROXYCAPRYLOYL PHYTOSPHINGOSINEHAIR CONDITIONING, SKIN CONDITIONING

HYDROXYCETYL HYDROXYETHYLSTEARAMIDESKIN CONDITIONING

HYDROXYCETYL ISOSTEARATESKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT, SURFACTANT - EMULSIFYING

HYDROXYCINNAMIC ACIDSKIN CONDITIONING

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 HYDROXYCAPRYLIC ACID appears in the CosIng inventory

The CosIng inventory lists HYDROXYCAPRYLIC ACID 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.

HYDROXYCAPRYLIC ACID 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

HYDROXYCAPRYLIC ACID 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, HYDROXYCAPRYLIC ACID carries the following function designation(s):

SKIN CONDITIONING

CAS 617-73-2 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 HYDROXYCAPRYLIC ACID

This page reproduces the CosIng inventory entry for HYDROXYCAPRYLIC ACID 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 HYDROXYCAPRYLIC ACID 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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