Ingredient review
C15-19 Isoparaffin
INCI: C15-19 Isoparaffin
A safe, lightweight synthetic oil that helps products spread smoothly and leaves a non-greasy feel.
In plain English
C15-19 Isoparaffin is a man-made oil derived from petroleum. It is very similar to mineral oil but lighter and less greasy. In skincare, it helps other ingredients spread easily, makes the product feel silky, and can help dissolve makeup or sunscreen. It does not clog pores for most people and is generally well-tolerated.
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
C15-19 Isoparaffin 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 C15-19 Isoparaffin.
- 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 branched-chain hydrocarbons with 15 to 19 carbon atoms, produced synthetically from petroleum refining.
How it works
It sits on the skin's surface as a thin, non-occlusive film, reducing friction so products glide on smoothly. It also acts as a solvent to dissolve oil-soluble ingredients like sunscreen filters or makeup pigments.
Pros
Lightweight feel
Unlike heavier oils, C15-19 Isoparaffin absorbs quickly and leaves no sticky residue, making it ideal for oily or acne-prone skin.
Low irritation potential
It is considered very safe and rarely causes allergic reactions or breakouts, even for sensitive skin types.
Cons and cautions
Petroleum-derived
As a synthetic hydrocarbon, it comes from non-renewable sources, which may be a concern for eco-conscious consumers.
Limited moisturizing power
It is an emollient but not a humectant or occlusive, so it may not provide enough hydration for very dry or dehydrated skin.
Best for
- People with oily or combination skin seeking a lightweight moisturizer
- Anyone who wants a non-greasy makeup remover or sunscreen
Use caution if
- Those who prefer exclusively plant-based or natural ingredients
- Individuals with very dry skin who need richer occlusives
Usage tips
Safety summary
C15-19 Isoparaffin is considered safe for cosmetic use. It has low skin irritation and sensitization potential, and is not known to be carcinogenic or toxic in the small amounts used in skincare.
Research notes
Safety assessments by the Cosmetic Ingredient Review (CIR) panel and EU SCCS have concluded that isoparaffins in this carbon range are safe for cosmetic use. No significant human or environmental toxicity has been reported at typical use levels.
Common label clues
- Typical concentration
- 1% to 10%
- Regulatory status
- Approved for use in cosmetics by the FDA and EU CosIng database. No concentration restrictions in leave-on or rinse-off products.
- Common uses
- Moisturizers, Makeup removers, Lip products, Sunscreens
- Environmental note
- Not biodegradable and derived from petroleum, but used in low concentrations. Some brands are moving toward bio-based alternatives.
Good to know
- Isoparaffins are often used in 'oil-free' products because they are technically not oils but hydrocarbons.
- They are also common in baby oils and makeup removers due to their gentle nature.
Common questions
What is C15-19 Isoparaffin in beauty products?
C15-19 Isoparaffin is a man-made oil derived from petroleum. It is very similar to mineral oil but lighter and less greasy. In skincare, it helps other ingredients spread easily, makes the product feel silky, and can help dissolve makeup or sunscreen. It does not clog pores for most people and is generally well-tolerated.
What does C15-19 Isoparaffin do in a beauty product?
It sits on the skin's surface as a thin, non-occlusive film, reducing friction so products glide on smoothly. It also acts as a solvent to dissolve oil-soluble ingredients like sunscreen filters or makeup pigments.
Is C15-19 Isoparaffin safe for most people?
C15-19 Isoparaffin is considered safe for cosmetic use. It has low skin irritation and sensitization potential, and is not known to be carcinogenic or toxic in the small amounts used in skincare.
Who should be careful with C15-19 Isoparaffin?
Those who prefer exclusively plant-based or natural ingredients Individuals with very dry skin who need richer occlusives
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.