Ingredient review
Sodium C11-15 Pareth-7 Carboxylate
INCI: SODIUM C11-15 PARETH-7 CARBOXYLATE
A gentle, low-irritation surfactant that effectively cleanses while being kinder to sensitive skin than traditional sulfates.
In plain English
This ingredient is a mild soap-like molecule that helps water mix with oil and dirt so they can be rinsed away. It's made from natural fatty alcohols (from coconut or palm oil) and a small amount of processed ethylene oxide, then modified to be extra gentle. Unlike harsh sulfates, it cleans without stripping your skin's natural moisture barrier, making it a popular choice for sensitive or dry skin formulas.
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
- semi synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Sodium C11-15 Pareth-7 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 Sodium C11-15 Pareth-7 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
Sodium C11-15 Pareth-7 Carboxylate is a semi-synthetic surfactant. It belongs to the alkyl ether carboxylate family, which combines a fatty alcohol chain (C11-15) with a short polyethylene glycol chain (7 units) and a carboxylate salt group. This structure gives it both water-loving and oil-loving properties, allowing it to emulsify and lift away impurities.
How it works
In a cosmetic product, this surfactant reduces the surface tension between water and oil, allowing the product to spread easily and trap dirt, sebum, and makeup. Its carboxylate group makes it less irritating than sulfate-based cleansers because it forms larger, gentler micelles that don't penetrate the skin barrier as aggressively. It also helps stabilize foam and improve the texture of cleansers.
Pros
Gentle on skin barrier
Unlike sodium lauryl sulfate, this surfactant cleans without stripping natural oils, helping maintain a healthy moisture barrier for dry or sensitive skin.
Versatile formula compatibility
Works well in both clear and creamy cleansers, and pairs nicely with other mild surfactants to create a pleasant, non-drying wash experience.
Cons and cautions
Potential palm oil sourcing
The fatty alcohol portion often comes from palm or coconut oil; if not sustainably sourced, it may contribute to deforestation concerns.
Trace impurity risk
As an ethoxylated ingredient, it may contain minute amounts of 1,4-dioxane, a potential carcinogen, though reputable manufacturers purify to safe levels below regulatory limits.
Best for
- People with dry or sensitive skin who find sulfates too harsh
- Anyone looking for a sulfate-free, gentle daily cleanser
Use caution if
- Individuals with known allergies to ethoxylated ingredients (rare)
Usage tips
Safety summary
Sodium C11-15 Pareth-7 Carboxylate is considered safe for use in cosmetics at typical concentrations. It has low skin irritation and sensitization potential. The main safety consideration is the possible presence of 1,4-dioxane, but regulatory limits and purification processes keep levels negligible in finished products.
Research notes
Alkyl ether carboxylates like this one have been studied for their mildness compared to traditional sulfates. Research shows they cause less protein denaturation and barrier disruption, making them suitable for sensitive skin. However, specific studies on this exact chain length (C11-15) are limited; safety is inferred from the broader class.
Common label clues
- Typical concentration
- 1–10% in rinse-off products; lower in leave-on formulas
- Regulatory status
- Approved for use in cosmetics globally, including by the EU CosIng database and the US FDA (as part of generally recognized safe surfactants). Manufacturers must ensure 1,4-dioxane levels are below 10 ppm in the final product per industry standards.
- Common uses
- Facial cleansers, Body washes, Shampoos, Makeup removers
- Environmental note
- The fatty alcohol source may be palm or coconut oil. Look for RSPO-certified palm or sustainably sourced coconut to minimize environmental impact. The ingredient is biodegradable under standard wastewater treatment conditions.
Good to know
- This ingredient is often listed near the middle or end of an ingredient list because it's used at moderate concentrations.
- It is considered a 'sulfate-free' surfactant, making it popular in gentle and natural-leaning skincare lines.
Common questions
What is Sodium C11-15 Pareth-7 Carboxylate in beauty products?
This ingredient is a mild soap-like molecule that helps water mix with oil and dirt so they can be rinsed away. It's made from natural fatty alcohols (from coconut or palm oil) and a small amount of processed ethylene oxide, then modified to be extra gentle. Unlike harsh sulfates, it cleans without stripping your skin's natural moisture barrier, making it a popular choice for sensitive or dry skin formulas.
What does Sodium C11-15 Pareth-7 Carboxylate do in a beauty product?
In a cosmetic product, this surfactant reduces the surface tension between water and oil, allowing the product to spread easily and trap dirt, sebum, and makeup. Its carboxylate group makes it less irritating than sulfate-based cleansers because it forms larger, gentler micelles that don't penetrate the skin barrier as aggressively. It also helps stabilize foam and improve the texture of cleansers.
Is Sodium C11-15 Pareth-7 Carboxylate safe for most people?
Sodium C11-15 Pareth-7 Carboxylate is considered safe for use in cosmetics at typical concentrations. It has low skin irritation and sensitization potential. The main safety consideration is the possible presence of 1,4-dioxane, but regulatory limits and purification processes keep levels negligible in finished products.
Who should be careful with Sodium C11-15 Pareth-7 Carboxylate?
Individuals 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.