Ingredient review
10-Undecenyl Acetate
INCI: 10-UNDECENYL ACETATE
A synthetic fragrance ingredient that adds a pleasant scent but offers no skincare benefits; generally safe at low levels.
In plain English
10-Undecenyl Acetate is a man-made chemical that smells nice and is added to products like lotions and perfumes to give them a pleasant fragrance. It doesn't do anything for your skin beyond scenting the product. It's used in tiny amounts, so it's usually not irritating, but if you have very sensitive skin or a fragrance allergy, you might want to avoid it.
Quick decision guide
Useful, but context matters
10-Undecenyl Acetate is generally a lower-concern ingredient when the full formula suits your skin.
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 10-Undecenyl Acetate.
- 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
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
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
10-Undecenyl Acetate is a synthetic ester derived from undecylenic acid (a fatty acid from castor oil) and acetic acid. It is a colorless liquid with a mild, floral, or fruity odor, used exclusively as a fragrance ingredient in cosmetics.
How it works
It works by evaporating from the skin's surface, releasing scent molecules that are detected by the nose. It has no active effect on the skin itself—its only role is to provide a pleasant fragrance experience.
Pros
Pleasant scent
Adds a mild, floral-fruity fragrance that can make products more enjoyable to use.
Low irritation potential
At typical low concentrations, it rarely causes irritation for most people, making it a relatively gentle fragrance option.
Cons and cautions
No skincare benefit
This ingredient only provides scent—it does not moisturize, protect, or improve the skin in any way.
Potential allergen
Like many fragrance ingredients, it can trigger allergic reactions or contact dermatitis in sensitive individuals, especially with repeated use.
Best for
- People who enjoy lightly scented products and have no fragrance sensitivities
- Those looking for a mild, non-overpowering fragrance option
Use caution if
- Individuals with known fragrance allergies or very sensitive skin
- Anyone following a fragrance-free skincare routine
Usage tips
Safety summary
10-Undecenyl Acetate is considered safe for most people at the low concentrations used in cosmetics. However, it can cause allergic reactions in fragrance-sensitive individuals, so those with known sensitivities should avoid it.
Research notes
Research on 10-Undecenyl Acetate is limited, but it is included in fragrance safety assessments by the Research Institute for Fragrance Materials (RIFM), which has found it to be non-irritating and non-sensitizing at typical use levels.
Common label clues
- Typical concentration
- Typically used at very low concentrations (under 1%) for scent
- Regulatory status
- Approved for use in cosmetics by the FDA and the European Commission, with concentration limits typically under 1% for leave-on products.
- Common uses
- Fragranced products, Perfumes, Body lotions, Cleansers
- Environmental note
- As a synthetic compound, its environmental impact is minimal at low use levels, but it is not biodegradable in all conditions.
Good to know
- 10-Undecenyl Acetate is often listed simply as 'fragrance' or 'parfum' on ingredient labels, so it may not appear by name.
- It is considered safe by major regulatory bodies when used within recommended limits.
Common questions
What is 10-Undecenyl Acetate in beauty products?
10-Undecenyl Acetate is a man-made chemical that smells nice and is added to products like lotions and perfumes to give them a pleasant fragrance. It doesn't do anything for your skin beyond scenting the product. It's used in tiny amounts, so it's usually not irritating, but if you have very sensitive skin or a fragrance allergy, you might want to avoid it.
What does 10-Undecenyl Acetate do in a beauty product?
It works by evaporating from the skin's surface, releasing scent molecules that are detected by the nose. It has no active effect on the skin itself—its only role is to provide a pleasant fragrance experience.
Is 10-Undecenyl Acetate safe for most people?
10-Undecenyl Acetate is considered safe for most people at the low concentrations used in cosmetics. However, it can cause allergic reactions in fragrance-sensitive individuals, so those with known sensitivities should avoid it.
Who should be careful with 10-Undecenyl Acetate?
Individuals with known fragrance allergies or very sensitive 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.