Ingredient review
C30-60 Alkyl Dimethicone
INCI: C30-60 ALKYL DIMETHICONE
A gentle, non-greasy silicone that gives skin a smooth, velvety finish without clogging pores.
In plain English
C30-60 Alkyl Dimethicone is a type of silicone that sits on the surface of your skin to create a soft, silky feel. It helps your moisturizer or makeup spread more easily and leaves a smooth, non-greasy finish. Because it's a larger molecule, it doesn't absorb deeply into the skin, which makes it very unlikely to cause irritation or breakouts. Think of it as a lightweight, invisible glove that helps your products glide on and stay put.
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
C30-60 Alkyl 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 C30-60 Alkyl 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 high molecular weight silicone polymer (a type of dimethicone) with alkyl (wax-like) side chains. It is synthetically produced and designed to provide a luxurious, silky texture in cosmetic formulations.
How it works
It forms a thin, breathable film on the skin's surface that reduces friction, making products feel smooth and easy to apply. This film also helps lock in moisture by reducing water loss (transepidermal water loss, or TEWL) and can improve the wear time of makeup by creating a barrier against sweat and humidity.
Pros
Silky, non-greasy finish
Leaves skin feeling smooth and velvety without any oily residue, making it ideal for primers and foundations.
Very low irritation potential
Because it stays on the surface and doesn't penetrate, it's unlikely to cause stinging, redness, or breakouts, even for sensitive skin.
Cons and cautions
Not biodegradable
As a synthetic silicone, it does not break down easily in the environment, which may be a concern for eco-conscious users.
Can cause pilling
If layered with water-based products or applied too thickly, it may ball up or roll off the skin, disrupting your makeup or skincare routine.
Best for
- Anyone looking for a smooth, velvety finish in moisturizers or primers
- People with normal to dry skin who want extra slip and a soft feel
Use caution if
- Those who strictly avoid silicones for personal or environmental reasons
Usage tips
Safety summary
C30-60 Alkyl Dimethicone is considered safe for use in cosmetics. It has a low irritation and comedogenic rating, and no significant safety concerns have been raised by regulatory bodies. However, as with all silicones, it is not biodegradable.
Research notes
Research on this specific alkyl dimethicone is limited, but it is chemically similar to other dimethicones that have been extensively reviewed by the Cosmetic Ingredient Review (CIR) panel and found safe for use in cosmetics at typical concentrations.
Common label clues
- Typical concentration
- 1% to 10%
- Regulatory status
- Approved for use in cosmetics globally, including by the U.S. FDA and EU CosIng database, with no known restrictions at typical use levels.
- Common uses
- Moisturizers, Primers, Foundations, Sunscreens, Hair conditioners
- Environmental note
- Silicones like this one are not biodegradable and can accumulate in aquatic environments. Some manufacturers are working on more eco-friendly alternatives.
Good to know
- C30-60 Alkyl Dimethicone is considered non-comedogenic, meaning it is unlikely to clog pores.
- It is often used in 'silicone-based' primers to fill in fine lines and pores for a blurred effect.
Common questions
What is C30-60 Alkyl Dimethicone in beauty products?
C30-60 Alkyl Dimethicone is a type of silicone that sits on the surface of your skin to create a soft, silky feel. It helps your moisturizer or makeup spread more easily and leaves a smooth, non-greasy finish. Because it's a larger molecule, it doesn't absorb deeply into the skin, which makes it very unlikely to cause irritation or breakouts. Think of it as a lightweight, invisible glove that helps your products glide on and stay put.
What does C30-60 Alkyl Dimethicone do in a beauty product?
It forms a thin, breathable film on the skin's surface that reduces friction, making products feel smooth and easy to apply. This film also helps lock in moisture by reducing water loss (transepidermal water loss, or TEWL) and can improve the wear time of makeup by creating a barrier against sweat and humidity.
Is C30-60 Alkyl Dimethicone safe for most people?
C30-60 Alkyl Dimethicone is considered safe for use in cosmetics. It has a low irritation and comedogenic rating, and no significant safety concerns have been raised by regulatory bodies. However, as with all silicones, it is not biodegradable.
Who should be careful with C30-60 Alkyl Dimethicone?
Those who strictly avoid silicones for personal or environmental reasons
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.