Ingredient review
C9-16 Alkane/Cycloalkane
INCI: C9-16 Alkane/Cycloalkane
A lightweight, silicone-like emollient that spreads easily and evaporates quickly, leaving a non-greasy feel.
In plain English
This is a blend of hydrocarbon molecules (alkanes and cycloalkanes) with carbon chain lengths between 9 and 16. It feels light and silky on the skin, similar to silicones, but it's made from petroleum-derived or synthetic sources. It helps other ingredients spread smoothly and evaporates quickly, so it doesn't leave a heavy or sticky residue.
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
C9-16 Alkane/Cycloalkane 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 C9-16 Alkane/Cycloalkane.
- 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 mixture of saturated hydrocarbons (alkanes) and cyclic hydrocarbons (cycloalkanes) with carbon chain lengths ranging from 9 to 16. It is a synthetic emollient often used as a replacement for silicones like cyclomethicone.
How it works
It sits on the skin's surface, reducing friction and helping other ingredients spread evenly. Its volatile nature means it evaporates partially after application, leaving a dry, silky feel without greasiness. It also helps dissolve oil-soluble ingredients.
Pros
Silicone alternative
Offers a similar silky, lightweight feel to silicones, making it a good option for silicone-free formulations.
Improves product texture
Helps creams and serums spread smoothly and absorb quickly, enhancing the user experience.
Cons and cautions
Petroleum-derived
Sourced from petroleum refining, which may be a concern for those seeking more sustainable or natural ingredients.
Potential dryness
Because it evaporates, it can leave very dry skin feeling less moisturized compared to richer emollients.
Best for
- People who prefer silicone-free products
- Those with oily or combination skin
- Anyone wanting a lightweight, fast-absorbing moisturizer
Use caution if
- Individuals with extremely dry or compromised skin barriers
- Those seeking only natural or plant-derived ingredients
Usage tips
Safety summary
Generally recognized as safe for topical use in cosmetics at typical concentrations. Low irritation and comedogenic risk, but limited long-term safety data are available.
Research notes
Used widely as a silicone substitute; safety assessments rely on its chemical similarity to other alkanes. No major safety concerns have been reported in cosmetic use.
Common label clues
- Typical concentration
- 1–30% depending on formulation
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions. Considered safe at typical concentrations by industry panels.
- Common uses
- Moisturizers, Serums, Cleansers, Makeup removers, Sunscreens
- Environmental note
- As a petroleum-derived ingredient, its production has a higher carbon footprint than some plant-based alternatives. It is not biodegradable in the same way as natural oils.
Good to know
- Often listed as 'C9-16 Alkane' on labels; may also appear as part of a blend.
- Commonly used in 'silicone-free' beauty products.
Common questions
What is C9-16 Alkane/Cycloalkane in beauty products?
This is a blend of hydrocarbon molecules (alkanes and cycloalkanes) with carbon chain lengths between 9 and 16. It feels light and silky on the skin, similar to silicones, but it's made from petroleum-derived or synthetic sources. It helps other ingredients spread smoothly and evaporates quickly, so it doesn't leave a heavy or sticky residue.
What does C9-16 Alkane/Cycloalkane do in a beauty product?
It sits on the skin's surface, reducing friction and helping other ingredients spread evenly. Its volatile nature means it evaporates partially after application, leaving a dry, silky feel without greasiness. It also helps dissolve oil-soluble ingredients.
Is C9-16 Alkane/Cycloalkane safe for most people?
Generally recognized as safe for topical use in cosmetics at typical concentrations. Low irritation and comedogenic risk, but limited long-term safety data are available.
Who should be careful with C9-16 Alkane/Cycloalkane?
Individuals with extremely dry or compromised skin barriers Those seeking only natural or plant-derived ingredients
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.