Excellent Preservative NOAEL Data SCCS/CIR Reviewed

Caprylhydroxamic Acid

Also known as: BRN 1703666, Caprylohydroxamic acid, EINECS 230-936-7, Octanoylhydroxamic acid, Taselin (+2 more)

INCI: CAPRYLHYDROXAMIC ACID

Caprylhydroxamic Acid (CAS 7377-03-9) is a cosmetic preservative functioning as preservative booster, chelating agent. Reported NOAEL =500 mg/kg bw/day in rat (CIR Safety Assessment); EU Regulation 1223/2009 status: permitted; 4 safety opinions reviewed (CIR Safety Assessment). Industrial safety data is also available in the chemical safety database. Same-CAS public records also appear in industrial chemical safety data.

View industrial chemical safety profile for CAS 7377-03-9 →

Auto-generated CPSR Part A draft with source citations
Function
preservative booster, chelating agent
Safety Rating
EXCELLENT

Chemistry & Identifiers

Formula
C8H17NO2
MW
159.23 g/mol
EC Number
230-936-7
PubChem CID
23846
IUPAC Name
N-hydroxyoctanamide
InChIKey
RGUVUPQQFXCJFC-UHFFFAOYSA-N

Regulatory Status

EU EU Status permitted
US US Status permitted
US Notes No restrictions; widely used in clean and natural preservative systems

For full compliance data across multiple jurisdictions, use the Substance Compliance tool.

Safety Data

Margin of Safety, dermal absorption, and sensitization profile summaries for Caprylhydroxamic Acid.

Calculate MoS for your specific formulation with the MoS Calculator.

Toxicological Studies

4 study endpoints found for Caprylhydroxamic Acid. NOAEL (No Observed Adverse Effect Level) values are used to calculate the Margin of Safety per SCCS methodology.

Endpoint Value Route Species Study Type Source
NOAEL =500 mg/kg bw/day oral rat developmental toxicity CIR Safety Assessment
NOAEL =500 mg/kg bw/day oral rat developmental toxicity CIR Safety Assessment
NOAEL =500 mg/kg bw/day oral rat developmental toxicity CIR Safety Assessment
NOAEL =500 mg/kg bw/day oral rat developmental toxicity CIR Safety Assessment

Safety Opinions

Official safety assessments from the Scientific Committee on Consumer Safety (SCCS) and Cosmetic Ingredient Review (CIR).

CIR Safety Assessment
Verdict: safe
NOAEL: 50 mg/kg bw/d (oral)

ation-induction-level (WoE NESIL) of 1056 μg/cm2. The Panel concluded that Caprylhydroxamic Acid is safe in cosmetics in the present practices of use and concentration described in this safety assessment. Keywords Cosmetic Ingredient Review, Expert Panel for Cosmetic Ingredient Safety, Safety, Cosmetics

CIR Safety Assessment
Verdict: safe
NOAEL: 50 mg/kg bw/d (oral)

ation-induction-level (WoE NESIL) of 1056 μg/cm2. The Panel concluded that Caprylhydroxamic Acid is safe in cosmetics in the present practices of use and concentration described in this safety assessment. Keywords Cosmetic Ingredient Review, Expert Panel for Cosmetic Ingredient Safety, Safety, Cosmetics

CIR Safety Assessment
Verdict: safe
NOAEL: 500 mg/kg bw/d (oral)

ation-induction-level (WoE NESIL) of 1056 μg/cm2. The Panel concluded that Caprylhydroxamic Acid is safe in cosmetics in the present practices of use and concentration described in this safety assessment. Keywords Cosmetic Ingredient Review, Expert Panel for Cosmetic Ingredient Safety, Safety, Cosmetics

CIR Safety Assessment
Verdict: safe
NOAEL: 1.17 mg/kg bw/d (oral)

ation-induction-level (WoE NESIL) of 1056 μg/cm2. The Panel concluded that Caprylhydroxamic Acid is safe in cosmetics in the present practices of use and concentration described in this safety assessment. Keywords Cosmetic Ingredient Review, Expert Panel for Cosmetic Ingredient Safety, Safety, Cosmetics

ECHA REACH Registration

European Chemicals Agency REACH dossier and Substances of Very High Concern listing.

Registration Type
Full
Tonnage Band
10 - 100 tonnes
Substance Type
SUBSTANCE
SVHC Candidate
No

Expanded Jurisdictional Detail

Additional regulatory detail beyond the 7-jurisdiction summary: Saudi SFDA, Korea MFDS, ASEAN ACD, Japan/Korea, Brazil/India, and cross-jurisdictional restriction entries.

Additional Jurisdictional Restrictions (1)
Jurisdiction Status Max % Product Type
CN permitted_preservative - All cosmetics (leave-on/rinse-off)

Additional Ingredient Properties

3 property records from structured ingredient metadata.

ph_stability
{"optimal_ph_min": "5.0", "optimal_ph_max": "7.0", "stable_ph_min": "4.0", "stable_ph_max": "8.0", "degrades_above_ph": "8.5", "degrades_below_ph": "3.5", "ph_dependent_function": "Chelator and preservative", "formulation_note": "Works with other systems", "source": "PMC 2023"}
preservative
{"preservative_class": "Hydroxamic acid", "antimicrobial_spectrum_bacteria_gp": "Good", "antimicrobial_spectrum_bacteria_gn": "Good", "antimicrobial_spectrum_yeast": "Yes", "antimicrobial_spectrum_mold": "Yes", "mic_staph_aureus_ppm": "1000", "mic_e_coli_ppm": "800", "mic_pseudomonas_ppm": "600", "mic_candida_albicans_ppm": "1200", "mic_aspergillus_niger_ppm": "1500", "challenge_test_pass_concentr…
synergy
{"inci_name_2": "Glycerin", "synergy_type": "preservation-boost", "synergy_description": "Natural chelator-preservative with humectant for gentle protection", "combined_benefit": "Natural preservation, metal chelation, multifunctional benefits", "efficacy_multiplier": "1.9x", "mechanism_of_action": "Caprylhydroxamic provides antimicrobial and chelating effects; glycerin adds humectancy", "optimal_…

Function Categories & List Membership

Cosmetic/Chemical Function Categories
Chelating agent Preservative

Expert Verdict

Expert safety assessment and concern-level summary for Caprylhydroxamic Acid.

Regulatory Flags

preservative-booster chelating hurdle-technology broad-ph-range paraben-free clean-beauty multifunctional

NOAEL Studies Summary

View details ->

Public NOAEL study rows linked to Caprylhydroxamic Acid by CAS number or substance name.

Studies
4
Lowest NOAEL
500 mg/kg bw/day
Highest NOAEL
500 mg/kg bw/day
CIR Safety Assessment

Known Synonyms

BRN 1703666 Caprylohydroxamic acid EINECS 230-936-7 Octanoylhydroxamic acid Taselin Octanohydroxamsaeure UNII-UPY805K99W

Chemical Function

Chelating agent Preservative

Australian Status

AICIS status: listed_with_terms

Specific information requirements: Obligations to provide information apply. These obligations are: 1. A person introducing this chemical must tell us in writing within 28 calendar days if any of the following circumstances have occurred in relation to their introduction (importation or manufacture): a. the introduction volume of the chemical exceeds 1...

Frequently Asked Questions

Is Caprylhydroxamic Acid safe in cosmetics?

Caprylhydroxamic Acid has a safety rating of "EXCELLENT" in our database. EU status: permitted. US status: permitted. 4 toxicological study endpoint(s) are available in our database. This ingredient has been reviewed by CIR Safety Assessment.

Is Caprylhydroxamic Acid allowed in the EU?

Caprylhydroxamic Acid EU regulatory status: permitted. This is based on EU Regulation 1223/2009 and its amendments.

What does Caprylhydroxamic Acid do in cosmetics?

Caprylhydroxamic Acid functions as: preservative booster, chelating agent. It is classified as a Preservative in our database. CAS number: 7377-03-9.

What is the NOAEL for Caprylhydroxamic Acid?

The NOAEL (No Observed Adverse Effect Level) for Caprylhydroxamic Acid is =500 mg/kg bw/day based on a developmental toxicity study via oral route in rat. A total of 4 study endpoints are available. Source: CIR Safety Assessment.

Is Caprylhydroxamic Acid used outside cosmetics?

Caprylhydroxamic Acid also appears in industrial chemical safety data. The cross-vertical cards on this page render same-CAS public rows from the matched databases.

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