Ingredient review
Isoeicosane
INCI: Isoeicosane
A lightweight, non-greasy emollient that helps products spread smoothly and leaves skin feeling soft without clogging pores.
In plain English
Isoeicosane is a synthetic oil-like ingredient made from petroleum. It feels very light on the skin, not heavy or sticky, and helps other ingredients spread evenly. It also helps dissolve certain ingredients that don't mix well with water. Think of it as a helper that makes creams and lotions feel silky and apply easily.
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
Isoeicosane 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 Isoeicosane.
- 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
Isoeicosane is a branched-chain hydrocarbon (a type of isoparaffin) with 20 carbon atoms. It is synthetically produced and belongs to the same family as mineral oil but is lighter and less greasy.
How it works
In a cosmetic product, isoeicosane acts as an emollient by filling in the spaces between skin cells, making the skin feel smoother and softer. It also works as a solvent, helping to dissolve other oil-soluble ingredients so they mix evenly into a formula. Its low viscosity allows it to spread quickly without leaving a heavy residue.
Pros
Lightweight feel
Isoeicosane spreads easily and absorbs quickly, leaving skin soft without a greasy or sticky residue—ideal for daytime use or under makeup.
Low pore-clogging risk
It has a low comedogenic rating, meaning it is unlikely to clog pores, making it suitable for acne-prone or oily skin types.
Cons and cautions
Petroleum-derived
Isoeicosane is a synthetic ingredient made from petroleum, which may not align with the preferences of those seeking natural or sustainable skincare options.
Not a standalone moisturizer
While it softens skin, isoeicosane does not add water or humectant properties, so it works best in formulas that also contain hydrating ingredients like glycerin or hyaluronic acid.
Best for
- People with oily or combination skin who want lightweight hydration
- Anyone looking for a non-comedogenic emollient in their moisturizer or makeup remover
Use caution if
- Those who strictly avoid petroleum-derived ingredients in their skincare
Usage tips
Safety summary
Isoeicosane is considered safe for topical use in cosmetics at typical concentrations. It has low irritation and comedogenic potential, though it is petroleum-derived, which may be a concern for some users.
Research notes
Isoeicosane is widely used in cosmetics as a lightweight emollient and solvent. Safety assessments by industry panels and regulatory bodies have found it safe for use in leave-on and rinse-off products at concentrations up to 10%.
Common label clues
- Typical concentration
- 1% to 10%
- Regulatory status
- Approved for use in cosmetics in the US (FDA) and EU (CosIng) as a safe emollient and solvent at typical concentrations.
- Common uses
- Moisturizers, Cleansers, Makeup removers, Sunscreens
- Environmental note
- As a synthetic hydrocarbon, isoeicosane is not biodegradable and is derived from non-renewable petroleum, which may have environmental implications.
Good to know
- Isoeicosane is often used in 'waterless' or anhydrous formulas because it helps dissolve oil-soluble actives.
- It is considered safe for use in cosmetics by major regulatory bodies at typical concentrations.
Common questions
What is Isoeicosane in beauty products?
Isoeicosane is a synthetic oil-like ingredient made from petroleum. It feels very light on the skin, not heavy or sticky, and helps other ingredients spread evenly. It also helps dissolve certain ingredients that don't mix well with water. Think of it as a helper that makes creams and lotions feel silky and apply easily.
What does Isoeicosane do in a beauty product?
In a cosmetic product, isoeicosane acts as an emollient by filling in the spaces between skin cells, making the skin feel smoother and softer. It also works as a solvent, helping to dissolve other oil-soluble ingredients so they mix evenly into a formula. Its low viscosity allows it to spread quickly without leaving a heavy residue.
Is Isoeicosane safe for most people?
Isoeicosane is considered safe for topical use in cosmetics at typical concentrations. It has low irritation and comedogenic potential, though it is petroleum-derived, which may be a concern for some users.
Who should be careful with Isoeicosane?
Those who strictly avoid petroleum-derived ingredients in their skincare
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.