Glyoxal

What is Glyoxal?

Glyoxal, chemically ethanedial (CHOCHO), is a volatile dialdehyde compound synthesized industrially from ethylene or glycol oxidation processes. In cosmetic formulations, it belongs to the functional additives category, primarily integrated into fragrance systems, preservation blends, and antimicrobial components. Its dual aldehyde groups confer high reactivity, allowing it to covalently bind with amine-containing molecules like proteins and peptides. This mechanism fixes volatile scent molecules to extend fragrance persistence, interferes with microbial metabolic pathways to curb bacterial and fungal proliferation in products, and provides broad-spectrum antimicrobial action against skin or formula contaminants. Commonly appearing in rinse-off items such as shampoos, cleansers, or deodorants at minimal levels, its protein-crosslinking properties also support subtle formula structuring. Regulatory oversight emphasizes controlled application due to inherent reactivity.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 9 View on EWG →
PubChem View on PubChem →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Fragrance ingredient
Contributes scent character and/or masks base odors, shaping the overall sensory experience of the formula (subject to allergen and IFRA considerations).
Preservative
Protects the product from microbial contamination during storage and use, helping maintain safety, stability, and shelf life.
Antimicrobial agent
Helps limit growth of bacteria and other microbes on skin or in the formula; may be used for product protection, odor control, or targeted antimicrobial effects.

Benefits

Stabilizes fragrance notes for consistent scent throughout product use.

Prevents microbial spoilage to extend shelf life and maintain formula integrity.

Limits bacterial growth in products for reliable performance.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
Users of scented rinse-off products seeking enduring aroma.
People with sensitive or easily irritated skin.
Consumers prioritizing long-lasting product freshness.
Those prone to contact allergies or sensitization.
Individuals using multi-dose formulas needing antimicrobial support.
Individuals with damaged or compromised skin barriers.

Safety Notes

  • Strong skin and eye irritant potential due to reactive aldehyde nature.
  • Risk of allergic sensitization from repeated or prolonged contact.

Frequently Asked Questions about Glyoxal

What roles does Glyoxal play in cosmetics?

Serves as fragrance ingredient to fix scents, preservative for stability, and antimicrobial agent against microbes.

Is Glyoxal comedogenic?

Rated 0, indicating low likelihood of pore-clogging.

Why high hazard ratings for Glyoxal?

Due to irritation, sensitization potential, and reactivity from authoritative safety assessments.