Ingredient review
C11-14 Alkyl Acetate
INCI: C11-14 Alkyl Acetate
A lightweight, non-greasy emollient that improves product texture and spreadability with a low risk of irritation or clogged pores.
In plain English
C11-14 Alkyl Acetate is a synthetic ingredient made from a fatty alcohol and acetic acid. It acts as an emollient, meaning it softens and smooths the skin by filling in tiny gaps between skin cells. Unlike heavier oils, it feels very light and silky, so it's often used in sunscreens and foundations to help them glide on without leaving a sticky or greasy finish. It also helps other active ingredients spread evenly across the skin.
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
C11-14 Alkyl 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 C11-14 Alkyl 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
A synthetic ester created by combining a medium-chain fatty alcohol (C11-14) with acetic acid. It is a clear, colorless liquid with a very low viscosity, designed to mimic the feel of natural oils without the heaviness.
How it works
When applied to the skin, it forms a thin, breathable film that reduces friction and helps the product spread easily. It also temporarily fills in fine lines and uneven texture, giving the skin a smoother appearance. Because it is non-occlusive (does not trap moisture tightly), it allows the skin to breathe while still providing a soft, silky feel.
Pros
Lightweight feel
Unlike heavier oils, C11-14 Alkyl Acetate leaves a silky, non-sticky finish that works well under makeup or in humid weather.
Low comedogenic risk
It is unlikely to clog pores, making it a safe choice for acne-prone or oily skin types.
Cons and cautions
Synthetic origin
It is manufactured in a lab, which may be a turn-off for consumers seeking 100% natural or plant-derived ingredients.
Not a hydrator
It smooths the skin but does not add water or humectant moisture, so it works best paired with hydrating ingredients like glycerin.
Best for
- People with oily or combination skin who want a lightweight moisturizer
- Anyone looking for a sunscreen or foundation that spreads smoothly without a greasy finish
Use caution if
- Those who strictly avoid synthetic ingredients in their skincare routine
Usage tips
Safety summary
C11-14 Alkyl Acetate is considered safe for use in cosmetics at typical concentrations. It has a low irritation and sensitization potential, and no significant toxicity has been reported in standard safety assessments.
Research notes
Safety data is primarily based on analog studies of similar alkyl acetates and esters. The Cosmetic Ingredient Review (CIR) panel has reviewed related esters and found them safe as used. Direct peer-reviewed studies on C11-14 Alkyl Acetate are limited, but its chemical class is well-understood.
Common label clues
- Typical concentration
- Typically 1–10% in leave-on products
- Regulatory status
- Approved for use in cosmetics in the EU, US, and most global markets. No concentration restrictions are typically imposed.
- Common uses
- Moisturizers, Sunscreens, Makeup foundations, Lip products
- Environmental note
- This ester is biodegradable and does not bioaccumulate, making it a more eco-friendly alternative to some persistent silicone oils.
Good to know
- C11-14 Alkyl Acetate is often used as a replacement for cyclomethicone in 'silicone-free' formulations.
- It is considered biodegradable and has a favorable environmental profile compared to some silicones.
Common questions
What is C11-14 Alkyl Acetate in beauty products?
C11-14 Alkyl Acetate is a synthetic ingredient made from a fatty alcohol and acetic acid. It acts as an emollient, meaning it softens and smooths the skin by filling in tiny gaps between skin cells. Unlike heavier oils, it feels very light and silky, so it's often used in sunscreens and foundations to help them glide on without leaving a sticky or greasy finish. It also helps other active ingredients spread evenly across the skin.
What does C11-14 Alkyl Acetate do in a beauty product?
When applied to the skin, it forms a thin, breathable film that reduces friction and helps the product spread easily. It also temporarily fills in fine lines and uneven texture, giving the skin a smoother appearance. Because it is non-occlusive (does not trap moisture tightly), it allows the skin to breathe while still providing a soft, silky feel.
Is C11-14 Alkyl Acetate safe for most people?
C11-14 Alkyl Acetate is considered safe for use in cosmetics at typical concentrations. It has a low irritation and sensitization potential, and no significant toxicity has been reported in standard safety assessments.
Who should be careful with C11-14 Alkyl Acetate?
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.