Ingredient review
C11-13 Pareth-10
INCI: C11-13 PARETH-10
A gentle cleansing agent that helps remove dirt and oil, but may cause mild irritation for very sensitive skin.
In plain English
C11-13 Pareth-10 is a synthetic ingredient that helps water mix with oil, making it easier to wash away dirt, makeup, and excess oil from your skin. It is commonly found in cleansers and shampoos. While it is generally considered mild, people with very sensitive or reactive skin might notice some dryness or irritation with frequent use.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Main practical flags: irritation is moderate; clogging risk is low.
- Source
- synthetic
- Evidence
- moderate
- Irritation
- moderate
- Clogging risk
- low
Quick decision guide
Useful, but context matters
C11-13 Pareth-10 can be useful, but watch for some irritation potential.
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 C11-13 Pareth-10.
- 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
moderateCan bother some users, especially with frequent use, damaged skin, or strong companion ingredients.
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
C11-13 Pareth-10 is a polyethylene glycol (PEG) ether of a mixture of synthetic fatty alcohols with 11 to 13 carbon atoms. It belongs to the 'pareth' family of surfactants, which are used to lower the surface tension between liquids, allowing them to mix and rinse away impurities.
How it works
In a cosmetic product, C11-13 Pareth-10 acts as a surfactant and emulsifier. Its molecular structure has a water-loving (hydrophilic) end and an oil-loving (lipophilic) end. When you apply a product containing it, it surrounds oil and dirt particles, allowing them to be lifted off the skin and rinsed away with water. It also helps keep oil and water blended in a formula so the product stays stable.
Pros
Effective cleanser
Removes excess oil, dirt, and makeup without the harshness of traditional sulfates, making it suitable for daily use.
Stable emulsifier
Helps maintain a consistent product texture, preventing separation of oil and water phases in creams and lotions.
Cons and cautions
Potential irritation
Even though it is milder than some surfactants, it can still cause dryness or stinging for those with very sensitive or reactive skin.
Synthetic origin
It is derived from petrochemicals, which may be a concern for those seeking fully natural or biodegradable ingredients.
Best for
- People with normal to oily skin looking for a gentle cleanser
- Those who prefer sulfate-free cleansing options
Use caution if
- Individuals with very sensitive, eczema-prone, or compromised skin barriers
Usage tips
Safety summary
C11-13 Pareth-10 is considered safe for use in cosmetics at typical concentrations. It is generally mild but can cause irritation in sensitive individuals. Avoid contact with eyes and broken skin.
Research notes
Safety assessments by the Cosmetic Ingredient Review (CIR) panel have concluded that pareth-type surfactants are safe for use in rinse-off products. Limited peer-reviewed studies exist specifically for C11-13 Pareth-10, but its chemical class is well-characterized.
Common label clues
- Typical concentration
- Usually 0.5% to 5% in rinse-off products
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions. The Cosmetic Ingredient Review (CIR) panel has reviewed similar pareth ingredients and found them safe for use in rinse-off products at typical concentrations.
- Common uses
- Cleansers, Shampoos, Body washes, Makeup removers
- Environmental note
- As a synthetic surfactant, it may not be fully biodegradable in all environments. However, it is not known to bioaccumulate significantly.
Good to know
- The number '10' in the name refers to the average number of ethylene oxide units in the molecule, which influences its water solubility and mildness.
- Pareth ingredients are often used as alternatives to sodium lauryl sulfate (SLS) in sulfate-free formulations.
Common questions
What is C11-13 Pareth-10 in beauty products?
C11-13 Pareth-10 is a synthetic ingredient that helps water mix with oil, making it easier to wash away dirt, makeup, and excess oil from your skin. It is commonly found in cleansers and shampoos. While it is generally considered mild, people with very sensitive or reactive skin might notice some dryness or irritation with frequent use.
What does C11-13 Pareth-10 do in a beauty product?
In a cosmetic product, C11-13 Pareth-10 acts as a surfactant and emulsifier. Its molecular structure has a water-loving (hydrophilic) end and an oil-loving (lipophilic) end. When you apply a product containing it, it surrounds oil and dirt particles, allowing them to be lifted off the skin and rinsed away with water. It also helps keep oil and water blended in a formula so the product stays stable.
Is C11-13 Pareth-10 safe for most people?
C11-13 Pareth-10 is considered safe for use in cosmetics at typical concentrations. It is generally mild but can cause irritation in sensitive individuals. Avoid contact with eyes and broken skin.
Who should be careful with C11-13 Pareth-10?
Individuals with very sensitive, eczema-prone, or compromised skin barriers
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.