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Moumoujus

GLUTARAL.

Avoid CAS 111-30-8 / FRAGRANCE, PRESERVATIVE

Glutaral is a potent biocide primarily utilized as a preservative in rinse-off cosmetic formulations. Its efficacy stems from its ability to chemically modify microbial proteins and nucleic acids, preventing product spoilage. Due to its significant irritancy and sensitization potential, its use in skincare is strictly regulated, with limited applications and stringent concentration limits.

Summary

Preservative Biocide Drying agent (medical)

Science

Mechanism of Action

Glutaral functions as a biocide primarily through alkylation, reacting with amino and thiol groups in microbial proteins and nucleic acids. This leads to the formation of stable covalent cross-links, denaturing proteins, inhibiting vital cellular processes, and ultimately causing cell death. It can penetrate microbial cell walls and viral outer layers, disrupting membrane integrity and causing cell lysis. In specific dermatological applications, it also facilitates wart removal by drying the skin.

Research

Clinical Evidence

Low confidence
Effective range 0.05–0.1%
Optimal

0.1%

Key findings

  1. 01 Ocular and dermal irritancy were substantially avoided in rinse-off products with brief and discontinuous exposure.
  2. 02 Identified as a no-effect concentration for skin irritation in a 28-day dermal toxicity study.
  3. 03 Simple skin irritation typically occurs upon contact.
  4. 04 Individuals previously sensitized to glutaraldehyde may develop dermatitis upon contact.
  5. 05 Caused irritation and sensitization on areas with thin stratum corneum (e.g., anterior ankle), but not on thick stratum corneum (e.g., heel) in an 8-week irritancy test.

Transparency

Dusting Analysis

Commonly dusted
Min. effective
0.1%
Red flag below
0.1%

Glutaral is often 'dusted' or avoided due to its high irritancy and sensitization risks, even at low concentrations. Regulatory bodies impose strict maximum concentrations (0.1% in the EU, 0.5% in CIR for rinse-off products) and prohibit its use in aerosols. Furthermore, there is insufficient data to support its functional safety in leave-on products beyond trace impurity levels. These factors, coupled with the availability of milder preservatives, make it a less desirable choice for precision skincare formulations.

The Formula

Formulation

Solubility
Water
Optimal pH N/A
0 7 14

Stability

Glutaral is commonly supplied as aqueous solutions (2%, 25%, or 50%). Its disinfectant properties can be enhanced by alkali activation.

Conflicts

  • Ingredients containing primary amine groups, due to its cross-linking (condensation) reactions.

Safety

Safety Profile

CIR Status
Safe with restrictions
Max tested
0.1%
Sensitization risk High

The CIR Expert Panel deems Glutaral safe up to 0.5% in rinse-off products, but notes insufficient data for functional use in leave-on products, where it is only considered safe as an impurity at concentrations up to 6 x 10^-6%. The SCCS (EU Cosmetics Directive) permits Glutaral as a preservative up to a maximum concentration of 0.1%; products exceeding 0.05% must carry a 'contains Glutaraldehyde' label. Both bodies prohibit its use in aerosolized products due to respiratory irritation. A 2-year dermal carcinogenicity study has been requested for leave-on applications. The FDA includes Glutaral in its direct and indirect food additive lists, with CIR's safety assessment reflecting FDA participation.

Your Skin

Skin Compatibility

No Normal
No Dry
No Oily
No Sensitive
Irritancy High
Comedogenicity Unknown

Our Assessment

Verdict

Avoid

Glutaral's high irritancy, significant sensitization risk, and lack of data for safe functional use in leave-on products render it unsuitable for precision skincare formulations, despite its efficacy as a preservative in highly restricted rinse-off applications.

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