Ingredient review

Acetaldehyde Ethyl Isoeugenyl Acetal

INCI: ACETALDEHYDE ETHYL ISOEUGENYL ACETAL

A synthetic fragrance compound that adds a warm, spicy note but may cause skin sensitivity in some individuals.

beautyskincarefragrance

In plain English

This is a man-made chemical used to give products a pleasant floral or spicy smell, similar to cloves or carnations. It is added in tiny amounts to perfumes, lotions, and other scented cosmetics. Because it is a fragrance ingredient, it can sometimes cause allergic reactions or irritation on sensitive skin.

Quick decision guide

Read the cautions before using

Acetaldehyde Ethyl Isoeugenyl Acetal can be useful, but watch for some irritation potential.

Plain-English read

Treat this as a practical screening step before you compare products that contain this ingredient.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Acetaldehyde Ethyl Isoeugenyl Acetal.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.

Score terms in plain English

Irritation risk

moderate

Can bother some users, especially with frequent use, damaged skin, or strong companion ingredients.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

emerging

The ingredient may be promising, but claims should be treated more cautiously.

What it is

A synthetic acetal compound created by chemically combining acetaldehyde with ethyl isoeugenol. It is not a natural extract but a lab-made molecule designed to deliver a specific scent profile.

How it works

In a cosmetic product, it acts solely as a fragrance ingredient. It evaporates from the skin after application, releasing its scent. It does not provide any skincare benefits like moisturizing or anti-aging.

Pros

Pleasant scent profile

Adds a warm, spicy, floral note that can make products more enjoyable to use.

Low concentration needed

Effective at very low levels, so it doesn't need to be a major ingredient in the formula.

Cons and cautions

Potential allergen

Like many fragrance ingredients, it can cause contact dermatitis or irritation in people with sensitive skin or allergies.

Limited research

There is less published safety data for this specific compound compared to more common fragrance allergens, making its long-term effects less understood.

Best for

  • People who enjoy scented products and have no history of fragrance allergies
  • Those using products where fragrance is a key part of the experience

Use caution if

  • Individuals with sensitive skin or known fragrance allergies
  • Anyone following a fragrance-free skincare routine

Usage tips

If you have sensitive skin, patch test any product containing this ingredient before full use.
Look for fragrance-free alternatives if you experience irritation from scented products.

Safety summary

Generally considered safe for most people at the low concentrations used in cosmetics, but it can be a skin sensitizer. Those with fragrance allergies should avoid it.

Research notes

There is limited peer-reviewed research specifically on acetaldehyde ethyl isoeugenyl acetal. Its safety is inferred from broader studies on fragrance allergens and related acetal compounds.

Common label clues

Typical concentration
Typically used at very low levels, often below 1% in finished products
Regulatory status
Approved for use in cosmetics in the EU and US, but subject to general fragrance allergen labeling requirements in some regions.
Common uses
Perfumes, Scented lotions, Fragranced cosmetics
Environmental note
As a synthetic compound, its environmental persistence and biodegradability are not well documented; natural fragrance alternatives may have a lower ecological footprint.

Good to know

  • This ingredient is not a preservative, active skincare ingredient, or emollient—it is purely for scent.
  • It may appear on ingredient lists under its INCI name, so check labels if you avoid synthetic fragrances.

Common questions

What is Acetaldehyde Ethyl Isoeugenyl Acetal in beauty products?

This is a man-made chemical used to give products a pleasant floral or spicy smell, similar to cloves or carnations. It is added in tiny amounts to perfumes, lotions, and other scented cosmetics. Because it is a fragrance ingredient, it can sometimes cause allergic reactions or irritation on sensitive skin.

What does Acetaldehyde Ethyl Isoeugenyl Acetal do in a beauty product?

In a cosmetic product, it acts solely as a fragrance ingredient. It evaporates from the skin after application, releasing its scent. It does not provide any skincare benefits like moisturizing or anti-aging.

Is Acetaldehyde Ethyl Isoeugenyl Acetal safe for most people?

Generally considered safe for most people at the low concentrations used in cosmetics, but it can be a skin sensitizer. Those with fragrance allergies should avoid it.

Who should be careful with Acetaldehyde Ethyl Isoeugenyl Acetal?

Individuals with sensitive skin or known fragrance allergies Anyone following a fragrance-free skincare routine

Research sources

European Chemicals Agency (ECHA) - Acetaldehyde ethyl isoeugenyl acetalOpenPubMed - Fragrance allergens and contact dermatitisOpen

Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.