What Is C11-13 Pareth-10?
C11-13 Pareth-10 is a non-ionic surfactant made by reacting a blend of C11 to C13 fatty alcohols with roughly ten units of ethylene oxide. The fatty alcohols often come from plant oils such as coconut or palm, though they can also be produced synthetically. First introduced in the mid-20th century when chemists were looking for gentler alternatives to traditional soaps, this ingredient quickly found a place in personal care formulas because it offers strong cleaning power without much irritation.
The manufacturing process, called ethoxylation, involves adding controlled amounts of ethylene oxide gas to the fatty alcohols under heat and pressure. The result is a clear or slightly cloudy liquid that mixes easily with both water and oil, making it very versatile in formulation work.
You can spot C11-13 Pareth-10 in a wide range of products such as facial cleansers, micellar waters, shampoos, body washes, makeup removers, lotions, light creams, exfoliating scrubs and sheet masks. Its ability to lift dirt while keeping formulas stable makes it especially popular in rinse-off products, though it also shows up at low levels in leave-on items that need a small boost in spreadability.
C11-13 Pareth-10’s Cosmetic Benefits/Uses
C11-13 Pareth-10 serves more than one job in a formulation, each adding to the overall performance of the product.
- Cleansing – Works as a gentle surfactant that loosens oil, makeup and everyday grime so they can be rinsed away easily. This helps leave skin and hair feeling fresh without the tight, squeaky feel harsher detergents can cause.
- Emulsifying – Helps water and oil mix smoothly, giving lotions and creams a uniform texture that stays stable on the shelf. This keeps products from separating and ensures each use delivers the same level of active ingredients.
Who Can Use C11-13 Pareth-10
C11-13 Pareth-10 is generally well tolerated by most skin types including normal, oily, combination and even sensitive skin thanks to its mild non-ionic nature. Extremely dry or compromised skin might feel a bit stripped if the ingredient is used at high levels in a rinse-off formula, so look for products balanced with moisturizers if dryness is a concern.
The fatty alcohols used to make C11-13 Pareth-10 are often derived from plant oils and the ethoxylation process is synthetic, so the ingredient itself is considered suitable for vegetarians and vegans. If sourcing is important, check with the brand to confirm the fatty alcohols are plant based, not animal derived.
No data suggest any specific risks for pregnant or breastfeeding women when C11-13 Pareth-10 is used topically in cosmetic concentrations. This is not medical advice and anyone who is expecting or nursing should review their skincare lineup with a healthcare professional to be safe.
The ingredient does not cause photosensitivity and it has no known interaction with sunlight or UV exposure. It is also fragrance-free and non-volatile which reduces the chance of inhalation irritation during normal use.
Potential Side Effects/Adverse Reactions
Reactions to topical C11-13 Pareth-10 differ from person to person. The points below outline potential side effects, though they are uncommon when the ingredient is formulated correctly.
- Mild skin irritation: Rare stinging or redness, most often in leave-on products used at higher percentages
- Eye irritation: Temporary discomfort if the product accidentally gets into the eyes
- Dryness: A tight feeling on very dry or sensitive skin if the formulation lacks adequate conditioners
- Allergic contact dermatitis: Extremely rare sensitization that may present as itching or rash
If any of these issues occur discontinue use and consult a healthcare professional for guidance.
Comedogenic Rating
Rating: 1/5 (very low)
C11-13 Pareth-10 is a water soluble non-ionic surfactant that rinses off cleanly without leaving a residue that could block pores. It contains no heavy fats or waxes commonly linked to congestion so its pore-clogging potential is minimal.
Generally suitable for acne prone or breakout prone skin.
Overall pore risk depends on the full formula so consider the entire ingredient list if clogging is a concern.
Summary
C11-13 Pareth-10 cleanses by surrounding oil, makeup and daily grime then lifting them into water so they can be washed away. Its ability to link water and oil also keeps emulsions smooth and stable which improves texture and shelf life.
The ingredient is not a headline grabber but it remains a quiet favorite with formulators thanks to its mildness versatility and reliable performance in both rinse off and leave on products.
Extensive safety data show a low risk of irritation when used at standard cosmetic levels. Still it is smart to patch test any new product that contains it to make sure your skin agrees with the overall formula.