Ingredient review

Glyceryl Undecyl Dimethicone

INCI: Glyceryl Undecyl Dimethicone

A lightweight silicone that smooths skin and reduces tackiness, generally well-tolerated and non-comedogenic.

beautyskincaresilicone

In plain English

This is a type of silicone that spreads easily on the skin, leaving a soft, velvety finish. It helps other ingredients glide on smoothly and can make the skin feel silky without clogging pores or feeling heavy.

Review score

Safety, usefulness, and evidence

4.0Good
4.0/ 5

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
How reviews are scored

Quick decision guide

Useful, but context matters

Glyceryl Undecyl 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.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Glyceryl Undecyl Dimethicone.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. 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

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

A synthetic silicone compound where a glycerin-derived group is attached to a silicone chain. It is designed to be a gentle, non-greasy emollient that improves the texture of skincare and cosmetic products.

How it works

It forms a thin, breathable film on the skin's surface that reduces friction, making products easier to apply. This film also helps lock in moisture by slowing water loss, while the silicone backbone gives a smooth, powdery after-feel.

Pros

Lightweight feel

Unlike heavier oils, this silicone gives a silky, almost powdery finish that doesn't weigh down the skin.

Improves product texture

It helps creams and serums spread more evenly and reduces the sticky or tacky feeling some formulas can have.

Cons and cautions

Potential buildup

Silicones can accumulate on the skin over time, which may require a double cleanse or a gentle exfoliating cleanser to fully remove.

Not biodegradable

As a synthetic silicone, it is not readily biodegradable, which may be a concern for environmentally conscious users.

Best for

  • People with normal to oily skin who want a lightweight moisturizer
  • Anyone looking for a smooth makeup primer or a non-sticky sunscreen

Use caution if

  • Those who prefer silicone-free or entirely natural skincare routines

Usage tips

Use a gentle cleanser or double cleanse to ensure thorough removal at the end of the day.
Layer it under makeup for a smooth, even application.

Safety summary

Glyceryl Undecyl Dimethicone is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic risk, making it suitable for most skin types.

Research notes

While specific studies on this exact ingredient are limited, the broader class of dimethicone derivatives has been extensively reviewed and deemed safe by expert panels such as the Cosmetic Ingredient Review (CIR).

Common label clues

Typical concentration
0.5% to 5%
Regulatory status
Approved for use in cosmetics in the US, EU, and many other regions. No specific restrictions beyond general cosmetic safety requirements.
Common uses
Moisturizers, Serums, Primers, Sunscreens, Makeup
Environmental note
Silicones like this one are not biodegradable and can persist in the environment. Some manufacturers are working on more eco-friendly alternatives.

Good to know

  • This ingredient is often used in 'soft focus' or blurring primers because of its light-diffusing properties.
  • It is considered a modified silicone, which can offer better compatibility with water-based formulas than standard dimethicone.

Common questions

What is Glyceryl Undecyl Dimethicone in beauty products?

This is a type of silicone that spreads easily on the skin, leaving a soft, velvety finish. It helps other ingredients glide on smoothly and can make the skin feel silky without clogging pores or feeling heavy.

What does Glyceryl Undecyl Dimethicone do in a beauty product?

It forms a thin, breathable film on the skin's surface that reduces friction, making products easier to apply. This film also helps lock in moisture by slowing water loss, while the silicone backbone gives a smooth, powdery after-feel.

Is Glyceryl Undecyl Dimethicone safe for most people?

Glyceryl Undecyl Dimethicone is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic risk, making it suitable for most skin types.

Who should be careful with Glyceryl Undecyl Dimethicone?

Those who prefer silicone-free or entirely natural skincare routines

Research sources

Cosmetic Ingredient Review (CIR) - Safety of Dimethicone and DerivativesOpenPubChem - Glyceryl Undecyl DimethiconeOpenEuropean Chemicals Agency (ECHA) - Silicone Safety DataOpen

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.