Ingredient review
Formaldehyde Cyclodecyl Ethyl Acetal
INCI: FORMALDEHYDE CYCLODECYL ETHYL ACETAL
A synthetic fragrance ingredient that adds scent but offers no skin benefit; may cause irritation in sensitive individuals.
In plain English
This is a man-made chemical used to make products smell nice, often with a floral or woody note. It doesn't help your skin in any way—it's purely for scent. Because it's a fragrance ingredient, it can sometimes cause irritation or allergic reactions, especially if you have sensitive skin.
Review score
Safety, usefulness, and evidence
Useful in the right context, but not low-maintenance
The evidence base is useful, but some claims depend heavily on the formula.
Main practical flags: irritation is moderate; clogging risk is low.
- Source
- synthetic
- Evidence
- moderate
- Irritation
- moderate
- Clogging risk
- low
Quick decision guide
Read the cautions before using
Formaldehyde Cyclodecyl Ethyl 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.
- Step 1Start with the score, then check the irritation and clogging risk before judging Formaldehyde Cyclodecyl Ethyl Acetal.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- 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
moderateCan bother some users, especially with frequent use, damaged skin, or strong companion ingredients.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
moderateThere is useful support, but formula details and claim strength still matter.
What it is
A synthetic acetal compound created by reacting formaldehyde with cyclodecyl ethyl alcohol. It is used exclusively as a fragrance ingredient in cosmetics and personal care products.
How it works
It evaporates from the skin's surface, releasing a pleasant scent. It has no known functional role beyond fragrance—it does not moisturize, protect, or treat the skin.
Pros
Pleasant scent
Adds a floral or woody fragrance that can enhance the sensory experience of using a product.
Low comedogenic risk
Unlikely to clog pores, making it suitable for non-acneic skin types when used in low concentrations.
Cons and cautions
Potential irritant
As a synthetic fragrance ingredient, it can cause redness, itching, or allergic reactions, especially in those with sensitive skin.
No skin benefit
Provides only scent; does not moisturize, soothe, or improve skin health in any way.
Best for
- People who enjoy scented skincare and do not have fragrance sensitivities.
- Those using products where fragrance is a desired sensory attribute.
Use caution if
- Individuals with sensitive, reactive, or allergy-prone skin.
- Anyone following a fragrance-free skincare routine.
Usage tips
Safety summary
Generally considered safe for most people at low concentrations, but can cause skin irritation or allergic reactions in sensitive individuals. Not recommended for those with fragrance allergies.
Research notes
Limited peer-reviewed research specifically on this ingredient. Safety assessments rely on general fragrance ingredient data and industry reports.
Common label clues
- Typical concentration
- Typically used at very low levels (under 1%) in finished products.
- Regulatory status
- Approved for use in cosmetics in the EU and US, but subject to fragrance allergen labeling requirements in the EU.
- Common uses
- Fragranced skincare, Perfumes, Body lotions
- Environmental note
- As a synthetic compound, its environmental persistence and biodegradability are not well-documented; limited data available.
Good to know
- This ingredient is a type of acetal, which is a stable compound formed from an aldehyde and an alcohol.
- It is not a formaldehyde releaser, but its name includes 'formaldehyde' due to its chemical structure.
Common questions
What is Formaldehyde Cyclodecyl Ethyl Acetal in beauty products?
This is a man-made chemical used to make products smell nice, often with a floral or woody note. It doesn't help your skin in any way—it's purely for scent. Because it's a fragrance ingredient, it can sometimes cause irritation or allergic reactions, especially if you have sensitive skin.
What does Formaldehyde Cyclodecyl Ethyl Acetal do in a beauty product?
It evaporates from the skin's surface, releasing a pleasant scent. It has no known functional role beyond fragrance—it does not moisturize, protect, or treat the skin.
Is Formaldehyde Cyclodecyl Ethyl Acetal safe for most people?
Generally considered safe for most people at low concentrations, but can cause skin irritation or allergic reactions in sensitive individuals. Not recommended for those with fragrance allergies.
Who should be careful with Formaldehyde Cyclodecyl Ethyl Acetal?
Individuals with sensitive, reactive, or allergy-prone skin. Anyone following a fragrance-free skincare routine.
Research sources
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.