Ingredient review
Bis-Benzyl Undecanoate Dimethicone
INCI: BIS-BENZYL UNDECANOATE DIMETHICONE
A lightweight silicone that helps products glide on smoothly and leaves a silky, non-greasy finish.
In plain English
This is a man-made silicone ingredient that makes skincare and makeup feel silky and smooth when you apply them. It spreads easily, helps other ingredients stay on your skin, and leaves a soft, powdery finish without feeling heavy or greasy.
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
Bis-Benzyl Undecanoate Dimethicone 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 Bis-Benzyl Undecanoate Dimethicone.
- 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 silicone polymer modified with benzyl undecanoate groups, designed to act as an emollient and film former in cosmetic formulations.
How it works
It forms a thin, breathable film on the skin's surface that reduces friction, improves product spreadability, and helps lock in moisture by minimizing water loss. The silicone structure also gives a smooth, velvety after-feel.
Pros
Silky texture
Creates a smooth, velvety feel on skin that many people find pleasant and non-greasy.
Improves product performance
Helps other ingredients spread evenly and can enhance the wear of makeup or sunscreen.
Cons and cautions
Synthetic ingredient
Not natural or biodegradable, which may be a concern for eco-conscious users.
Limited independent research
Most safety data comes from industry sources; long-term skin effects are not extensively studied.
Best for
- People who enjoy a silky, smooth finish in moisturizers or primers
- Those with normal to combination skin looking for lightweight hydration
Use caution if
- Individuals who prefer silicone-free or 100% natural skincare routines
- Those with known sensitivity to silicones (rare)
Usage tips
Safety summary
Bis-Benzyl Undecanoate Dimethicone is considered safe for topical use in cosmetics at typical concentrations. It has low irritation and comedogenic potential, though individuals with very sensitive skin should patch test new products.
Research notes
Safety assessments rely on analogy to other dimethicone derivatives and industry data. Peer-reviewed studies specific to this ingredient are scarce, but the broader silicone class is well-tolerated.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the US, EU, and many other regions, subject to general cosmetic safety regulations.
- Common uses
- Moisturizers, Serums, Primers, Sunscreens
- Environmental note
- Silicones can persist in the environment; some formulations are designed to be more biodegradable, but this specific variant's environmental fate is not well documented.
Good to know
- Silicones like this one are generally considered safe by cosmetic safety panels
- It is often used in primers to create a smooth canvas for foundation
Common questions
What is Bis-Benzyl Undecanoate Dimethicone in beauty products?
This is a man-made silicone ingredient that makes skincare and makeup feel silky and smooth when you apply them. It spreads easily, helps other ingredients stay on your skin, and leaves a soft, powdery finish without feeling heavy or greasy.
What does Bis-Benzyl Undecanoate Dimethicone do in a beauty product?
It forms a thin, breathable film on the skin's surface that reduces friction, improves product spreadability, and helps lock in moisture by minimizing water loss. The silicone structure also gives a smooth, velvety after-feel.
Is Bis-Benzyl Undecanoate Dimethicone safe for most people?
Bis-Benzyl Undecanoate Dimethicone is considered safe for topical use in cosmetics at typical concentrations. It has low irritation and comedogenic potential, though individuals with very sensitive skin should patch test new products.
Who should be careful with Bis-Benzyl Undecanoate Dimethicone?
Individuals who prefer silicone-free or 100% natural skincare routines Those with known sensitivity to silicones (rare)
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.