Ingredient review
Butyl Undecenoate
INCI: Butyl Undecenoate
Butyl Undecenoate is a lightweight synthetic emollient that helps products glide on smoothly without a greasy feel.
In plain English
Butyl Undecenoate is a man-made oil-like ingredient that makes skincare products feel silky and spread easily on your skin. It doesn't clog pores or cause irritation for most people, making it a good choice for lightweight moisturizers and sunscreens.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Butyl Undecenoate 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 Butyl Undecenoate.
- 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
Butyl Undecenoate is a synthetic ester derived from undecylenic acid, a fatty acid found naturally in castor oil. It is produced through a chemical process to create a stable, non-greasy emollient.
How it works
It works by forming a thin, smooth film on the skin's surface, which reduces friction and helps other ingredients spread evenly. This improves the sensory feel of a product, making it less sticky or oily.
Pros
Lightweight texture
Butyl Undecenoate feels silky and non-greasy, making it ideal for daytime moisturizers and sunscreens, especially for oily or combination skin types.
Low irritation potential
It has a low risk of causing skin irritation or allergic reactions, so it's generally safe for sensitive skin when used in typical concentrations.
Cons and cautions
Synthetic origin
As a lab-created ingredient, it may not appeal to consumers seeking natural or plant-based formulations, even though it's derived from a natural source.
Limited skin benefit data
While it improves product feel, there is little evidence that Butyl Undecenoate provides direct skin benefits like hydration or anti-aging beyond its emollient role.
Best for
- People with oily or combination skin who want a lightweight moisturizer
- Anyone looking for a non-greasy sunscreen or makeup base
Use caution if
- Those who strictly avoid synthetic ingredients in their skincare routine
Usage tips
Safety summary
Butyl Undecenoate is considered safe for cosmetic use with low irritation and comedogenic potential. It is not a common allergen and has no known toxicity concerns at typical concentrations.
Research notes
Research on Butyl Undecenoate is limited but consistent with its role as a safe emollient. It is included in the CosIng database and has been reviewed by the Cosmetic Ingredient Review (CIR) panel as safe for use in cosmetics.
Common label clues
- Typical concentration
- 1% to 10%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and other major markets. It is listed on the CosIng database and considered safe at typical usage levels.
- Common uses
- Moisturizers, Serums, Sunscreens, Makeup foundations
- Environmental note
- Butyl Undecenoate is biodegradable and not known to bioaccumulate, making it a relatively eco-friendly synthetic emollient.
Good to know
- Butyl Undecenoate is often used in sunscreens to improve the feel of zinc oxide or titanium dioxide formulas.
- It is considered biodegradable and has a low environmental impact compared to some silicone-based emollients.
Common questions
What is Butyl Undecenoate in beauty products?
Butyl Undecenoate is a man-made oil-like ingredient that makes skincare products feel silky and spread easily on your skin. It doesn't clog pores or cause irritation for most people, making it a good choice for lightweight moisturizers and sunscreens.
What does Butyl Undecenoate do in a beauty product?
It works by forming a thin, smooth film on the skin's surface, which reduces friction and helps other ingredients spread evenly. This improves the sensory feel of a product, making it less sticky or oily.
Is Butyl Undecenoate safe for most people?
Butyl Undecenoate is considered safe for cosmetic use with low irritation and comedogenic potential. It is not a common allergen and has no known toxicity concerns at typical concentrations.
Who should be careful with Butyl Undecenoate?
Those who strictly avoid synthetic ingredients in their 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.