Ingredient review
Undecane
INCI: UNDECANE
Undecane is a lightweight, non-greasy emollient that helps skincare products glide on smoothly without clogging pores.
In plain English
Undecane is a type of oil that comes from petroleum, but it's very lightweight and evaporates quickly from the skin. It's used in skincare to help creams and lotions spread easily without feeling heavy or sticky. Think of it as a helper ingredient that makes your moisturizer feel silky and fast-absorbing.
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
Undecane 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 Undecane.
- 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
Undecane is a straight-chain hydrocarbon (C11H24) that belongs to the alkane family. It is a colorless, volatile liquid at room temperature and is typically produced synthetically for cosmetic use.
How it works
Undecane acts as an emollient and solvent. As an emollient, it softens and smooths the skin by filling in gaps between skin cells. As a solvent, it helps dissolve other ingredients and improves the texture and spreadability of the product. Its volatility means it evaporates partially after application, leaving a non-greasy feel.
Pros
Lightweight feel
Undecane evaporates quickly, leaving skin feeling smooth and not greasy, which is great for oily skin types.
Low irritation potential
It has a low risk of causing skin irritation or allergic reactions, making it suitable for sensitive skin.
Cons and cautions
Petroleum-derived
Undecane is a synthetic hydrocarbon from petroleum, which may be a concern for those preferring natural or sustainable ingredients.
Limited research
There is not a lot of published research on undecane's long-term effects on skin, though it is considered safe at typical use levels.
Best for
- People with oily or combination skin who want lightweight hydration
- Anyone who dislikes heavy, greasy moisturizers
Use caution if
- Those seeking exclusively natural or plant-derived ingredients
Usage tips
Safety summary
Undecane is considered safe for use in cosmetics at typical concentrations. It has low skin irritation and comedogenic potential, but as a synthetic hydrocarbon, it may not be ideal for those seeking natural ingredients.
Research notes
Research on undecane specifically is limited, but it is part of a class of alkanes that have been reviewed by safety panels and found to be safe for cosmetic use. Most evidence comes from industry safety assessments rather than independent clinical studies.
Common label clues
- Typical concentration
- 1% to 10%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions. The Cosmetic Ingredient Review (CIR) panel has evaluated similar alkanes and found them safe at typical concentrations.
- Common uses
- Moisturizers, Cleansers, Makeup removers, Sunscreens
- Environmental note
- As a petroleum-derived ingredient, undecane has a higher carbon footprint compared to plant-based alternatives. It is not biodegradable in the environment.
Good to know
- Undecane is often paired with tridecane in cosmetic formulations to create a volatile emollient system.
- It is also used in some makeup removers to help dissolve waterproof makeup without heavy oils.
Common questions
What is Undecane in beauty products?
Undecane is a type of oil that comes from petroleum, but it's very lightweight and evaporates quickly from the skin. It's used in skincare to help creams and lotions spread easily without feeling heavy or sticky. Think of it as a helper ingredient that makes your moisturizer feel silky and fast-absorbing.
What does Undecane do in a beauty product?
Undecane acts as an emollient and solvent. As an emollient, it softens and smooths the skin by filling in gaps between skin cells. As a solvent, it helps dissolve other ingredients and improves the texture and spreadability of the product. Its volatility means it evaporates partially after application, leaving a non-greasy feel.
Is Undecane safe for most people?
Undecane is considered safe for use in cosmetics at typical concentrations. It has low skin irritation and comedogenic potential, but as a synthetic hydrocarbon, it may not be ideal for those seeking natural ingredients.
Who should be careful with Undecane?
Those seeking exclusively 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.