Ingredient review
C26-28 Alkyl Dimethicone
INCI: C26-28 ALKYL DIMETHICONE
A gentle silicone emollient that smooths skin and improves product feel without clogging pores.
In plain English
This is a type of silicone oil that sits on the surface of your skin to create a smooth, silky finish. It helps other ingredients spread more evenly and gives products a luxurious, non-greasy feel. Because it's made of larger molecules, it stays on top of the skin rather than being absorbed deeply, which makes it a good option for people who want a lightweight, non-sticky texture.
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
C26-28 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 C26-28 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 synthetic silicone polymer with long alkyl (wax-like) chains attached. It is part of the dimethicone family but has a higher molecular weight, making it less volatile and more film-forming than standard dimethicone.
How it works
It forms a thin, breathable film on the skin that reduces water loss (acts as an occlusive) while also filling in fine lines and pores for a temporary smoothing effect. Its silicone backbone gives a silky, velvety feel, and the alkyl chains add a slight emollient, moisturizing quality.
Pros
Silky, non-greasy feel
Leaves skin feeling smooth and velvety without a heavy or oily residue, making it ideal for daytime use and under makeup.
Low irritation potential
Rated very low on both irritation and comedogenic scales, so it's generally safe for sensitive and acne-prone skin types.
Cons and cautions
May cause pilling
When layered with certain water-based serums or gels, the silicone film can ball up or pill, disrupting your makeup or sunscreen application.
Not biodegradable
As a synthetic silicone, it does not break down easily in the environment, which is a concern for eco-conscious consumers.
Best for
- People with normal to dry skin looking for a lightweight, non-greasy moisturizer
- Anyone who wants a smooth makeup base or primer that helps foundation glide on
Use caution if
- Those who strictly avoid silicones in their skincare routine
Usage tips
Safety summary
C26-28 Alkyl Dimethicone is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic profile, and no significant safety concerns have been raised by regulatory bodies or dermatological reviews.
Research notes
Research on this specific alkyl dimethicone is limited, but the broader family of dimethicone derivatives has been well-studied and is generally recognized as safe for topical use. Studies show they are non-irritating, non-sensitizing, and do not penetrate the skin barrier significantly.
Common label clues
- Typical concentration
- Typically 1–10% in leave-on products
- Regulatory status
- Approved as a cosmetic ingredient in the US, EU, and many other regions. No known restrictions at typical use levels.
- Common uses
- Moisturizers, Serums, Sunscreens, Foundations, Primers
- Environmental note
- Silicones like this one are not readily biodegradable and can accumulate in aquatic environments. Some manufacturers are moving toward biodegradable alternatives.
Good to know
- C26-28 Alkyl Dimethicone is often used in 'silicone blend' ingredients to adjust texture and feel.
- It is considered a 'non-volatile' silicone, meaning it does not evaporate from the skin like some lighter silicones.
Common questions
What is C26-28 Alkyl Dimethicone in beauty products?
This is a type of silicone oil that sits on the surface of your skin to create a smooth, silky finish. It helps other ingredients spread more evenly and gives products a luxurious, non-greasy feel. Because it's made of larger molecules, it stays on top of the skin rather than being absorbed deeply, which makes it a good option for people who want a lightweight, non-sticky texture.
What does C26-28 Alkyl Dimethicone do in a beauty product?
It forms a thin, breathable film on the skin that reduces water loss (acts as an occlusive) while also filling in fine lines and pores for a temporary smoothing effect. Its silicone backbone gives a silky, velvety feel, and the alkyl chains add a slight emollient, moisturizing quality.
Is C26-28 Alkyl Dimethicone safe for most people?
C26-28 Alkyl Dimethicone is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic profile, and no significant safety concerns have been raised by regulatory bodies or dermatological reviews.
Who should be careful with C26-28 Alkyl Dimethicone?
Those who strictly avoid silicones 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.