Skip to content

GREENVEIL

  • beauty
  • industrial

(E)-Crotonaldehyde

CAS 123-73-9

Also registered as 1 other CAS number

4170-30-3

(E)-Crotonaldehyde chemical structure

Concern score

Not assessed — no hazard data yet.

(E)-Crotonaldehyde in plain language

What it is

On cosmetic ingredient lists it appears as “Crotonaldehyde”.

Also known as Crotonaldehyde · Crotonaldehyde e-form · Crotonaldehyde, (2E)- · (2E)-But-2-enal · (e)-.beta.-methylacrolein · (e)-crotonic aldehyde

Show all 33 names

(E)-but-2-enal · (2E)-2-Butenal · (E)-But-2-en-1-al · (E)-Crotonaldehyd · (e)-2-butenal · 1-Formylpropene · 2-BUTENAL, (e)- · 2-Butenal · 2-Butenal, (2E)- · 2-Butenaldehyde · But-2-enal · Crotonal · Crotonaldehyde, (E) · Crotonic aldehyde · Crotylaldehyde · Krotonaldehyd · Methylpropenal · NCI-C56279 · Propylene aldehyde · RCRA waste number U053 · TRANS-2-BUTENAL · Trans-crotonaldehyde · Un 1143 · Un 1143 (dot) · beta-Methyl acrolein · beta-Methylacrolein · trans-2-butenaldehyde

What it does

Used in cosmetics as an antioxidant and a fragrance ingredient.

  • Antioxidant
  • Perfuming
  • Fragrance
  • Flavouring
Is it a concern?
We haven't assessed a concern score for this ingredient yet. It is listed for cosmetic use in the EU.

Regulation

No restrictions found. (E)-Crotonaldehyde appears in these published regulatory listings.

Recorded in these product areas

  • Found in consumer products
  • Industrial
  • EUCosIngActiveRestriction: II/1065
  • USEPAcommercial use observedEPA CPDat observed this chemical in 3 composition records across product categories including Laboratory supplies. EPA CPDat classifies this chemical for functional uses including Flavouring and nutrient.
    • EPA CPDat observed this chemical in 3 composition records across product categories including Laboratory supplies. EPA CPDat classifies this chemical for functional uses including Flavouring and nutrient.Source →
  • USFDAlisted in openFDA substanceopenFDA substance registry classifies this ingredient as chemical.
    • openFDA substance registry classifies this ingredient as chemical.Source →

Expert safety opinions

No expert opinion on file for (E)-Crotonaldehyde. These are the independent scientific bodies that assess ingredients like this one; we show an opinion only when a record we hold cites it.

  • SCCS

    EU Scientific Committee on Consumer Safety

    No SCCS opinion on file.

  • CIR

    Cosmetic Ingredient Review (US expert panel)

    No CIR safety assessment on file.

Evidence & sources

No graded research studies for (E)-Crotonaldehyde yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.

6 data sources

Where this comes from

  • CosIng

    regulatory · updated 2026-09-23

    Open →

  • EPA Chemical and Products Database

    exposure · updated 2020-03-12

    Open →

  • EPA DSSTox Identifiers

    chemistry · updated 2025-12-29

    Open →

  • FDA GSRS UNII

    registry · updated 2026-02-26

    Open →

  • openFDA Substance

    registry · updated 2026-05-24

    Open →

  • PubChem Live Enrichment

    chemistry · updated 2026-05-17

    Open →

Suitability

Context-specific fit derived from published classifications and the current ingredient evidence profile.

Fragrance avoidance

Not a strong fit for fragrance avoidance because it carries Fragrance.

Avoid

The ingredient itself is a fragrance-linked signal, so it is better treated as an avoid case when fragrance exposure is the main concern.

Where it has been recorded

How often EPA CPDat has listed (E)-Crotonaldehyde in a product composition. These are source records, not Greenveil catalog products.

Source records

3

Named organisations

2

Laboratory supplies

Typical roles

AntioxidantPerfumingFragranceFlavouring
See products using (E)-Crotonaldehyde →