Ingredient review
Isopropyl C12-15 Pareth-9 Carboxylate
INCI: ISOPROPYL C12-15-PARETH-9 CARBOXYLATE
A mild synthetic surfactant that helps cleanse without stripping the skin's natural moisture barrier.
In plain English
This is a lab-made ingredient that helps water and oil mix together so that dirt and makeup can be rinsed away. It is designed to be gentle on the skin, making it a popular choice in cleansers for sensitive or dry skin types.
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
Isopropyl C12-15 Pareth-9 Carboxylate 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 Isopropyl C12-15 Pareth-9 Carboxylate.
- 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 surfactant derived from isopropyl alcohol and a fatty alcohol ethoxylate. It is part of a class of ingredients called ether carboxylates, known for their mild cleansing properties.
How it works
It reduces the surface tension between water and oil, allowing them to blend. This helps lift dirt, oil, and makeup from the skin so they can be easily washed away. Its carboxylate group also provides some skin-conditioning benefits, leaving skin feeling soft after cleansing.
Pros
Gentle on skin
Unlike harsher sulfates, this surfactant cleans effectively without stripping the skin's natural oils, making it suitable for daily use.
Conditioning feel
It leaves skin feeling soft and smooth after rinsing, reducing the need for additional moisturizers in some routines.
Cons and cautions
Synthetic origin
It is manufactured through chemical processes, which may be a drawback for those seeking exclusively natural or plant-derived ingredients.
Limited research
Compared to more common surfactants, there is less independent research on its long-term effects, though available data supports its safety.
Best for
- People with dry or sensitive skin looking for a gentle cleanser
- Anyone who prefers sulfate-free cleansing products
Use caution if
- Those with known allergies to ethoxylated ingredients (rare)
Usage tips
Safety summary
Generally recognized as safe for use in rinse-off cosmetics at typical concentrations. Mild and well-tolerated by most skin types, though patch testing is recommended for those with extreme sensitivities.
Research notes
Safety assessments by cosmetic ingredient review panels have found this ingredient to be safe when formulated appropriately. Most evidence comes from industry studies and regulatory reviews rather than independent clinical trials.
Common label clues
- Typical concentration
- 1% to 10%
- Regulatory status
- Approved for use in cosmetics in the US (FDA) and EU (CosIng) with no known restrictions at typical concentrations.
- Common uses
- Cleansers, Shampoos, Body washes, Facial cleansers
- Environmental note
- As a synthetic ethoxylate, it may have moderate biodegradability. Always check product labels for eco-certifications if this is a concern.
Good to know
- It is often used in combination with other surfactants to improve foam and cleansing power.
- The 'C12-15' refers to the carbon chain length of the fatty alcohol used, which affects its cleansing strength.
Common questions
What is Isopropyl C12-15 Pareth-9 Carboxylate in beauty products?
This is a lab-made ingredient that helps water and oil mix together so that dirt and makeup can be rinsed away. It is designed to be gentle on the skin, making it a popular choice in cleansers for sensitive or dry skin types.
What does Isopropyl C12-15 Pareth-9 Carboxylate do in a beauty product?
It reduces the surface tension between water and oil, allowing them to blend. This helps lift dirt, oil, and makeup from the skin so they can be easily washed away. Its carboxylate group also provides some skin-conditioning benefits, leaving skin feeling soft after cleansing.
Is Isopropyl C12-15 Pareth-9 Carboxylate safe for most people?
Generally recognized as safe for use in rinse-off cosmetics at typical concentrations. Mild and well-tolerated by most skin types, though patch testing is recommended for those with extreme sensitivities.
Who should be careful with Isopropyl C12-15 Pareth-9 Carboxylate?
Those with known allergies to ethoxylated ingredients (rare)
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.