Ingredient review
Sodium C9-11 Pareth-6 Carboxylate
INCI: SODIUM C9-11 PARETH-6 CARBOXYLATE
A gentle, synthetic cleanser that effectively removes impurities while being less likely to cause irritation than traditional sulfates.
In plain English
Sodium C9-11 Pareth-6 Carboxylate is a man-made cleansing ingredient often used in gentle face washes and body cleansers. It works by helping water mix with oil and dirt so they can be rinsed away easily. Unlike harsher detergents like sodium lauryl sulfate, this one is designed to be mild on the skin and is often found in products for sensitive or dry skin.
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
Sodium C9-11 Pareth-6 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 C9-11 Pareth-6 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 fatty alcohols (C9-11) and ethylene oxide, then carboxylated to create a mild cleansing molecule. It belongs to the class of alkyl ether carboxylates, known for their gentle cleansing and good foaming properties.
How it works
In a cosmetic product, it lowers the surface tension between water and oil, allowing dirt, sebum, and makeup to be lifted from the skin and rinsed away. Its carboxylate group gives it a mild pH and reduces irritation potential compared to sulfate-based cleansers.
Pros
Mild on skin
This surfactant is formulated to be less irritating than traditional sulfates, making it suitable for daily use on sensitive or dry skin.
Effective cleansing
It removes dirt, oil, and makeup efficiently while maintaining a gentle feel, reducing the risk of over-drying.
Cons and cautions
Synthetic origin
It is manufactured through chemical processes, which may not align with preferences for natural or organic skincare routines.
Potential for mild dryness
In high concentrations or without moisturizing co-ingredients, it can still cause slight dryness for very dry skin types.
Best for
- People with normal to dry skin looking for a gentle cleanser
- Those with sensitive skin who react to sulfate-based cleansers
Use caution if
- Individuals seeking 100% natural or plant-derived ingredients only
Usage tips
Safety summary
Sodium C9-11 Pareth-6 Carboxylate is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential, making it a good choice for sensitive skin. However, as with any surfactant, individual reactions are possible.
Research notes
Alkyl ether carboxylates like this one are well-studied as mild surfactants. Research indicates they are less damaging to skin barrier function compared to sodium lauryl sulfate. Most safety data comes from industry and regulatory assessments.
Common label clues
- Typical concentration
- Typically 1–10% in rinse-off products; lower in leave-on formulations
- Regulatory status
- Approved for use in cosmetics in the EU, US, and other major markets. Generally recognized as safe when used as directed.
- Common uses
- Facial cleansers, Body washes, Shampoos, Makeup removers
- Environmental note
- Synthetic surfactants may have variable biodegradability; check product labeling for eco-friendly claims.
Good to know
- Often listed alongside other mild surfactants in sulfate-free formulations.
- Has a pH close to skin's natural pH, which helps maintain the skin barrier.
Common questions
What is Sodium C9-11 Pareth-6 Carboxylate in beauty products?
Sodium C9-11 Pareth-6 Carboxylate is a man-made cleansing ingredient often used in gentle face washes and body cleansers. It works by helping water mix with oil and dirt so they can be rinsed away easily. Unlike harsher detergents like sodium lauryl sulfate, this one is designed to be mild on the skin and is often found in products for sensitive or dry skin.
What does Sodium C9-11 Pareth-6 Carboxylate do in a beauty product?
In a cosmetic product, it lowers the surface tension between water and oil, allowing dirt, sebum, and makeup to be lifted from the skin and rinsed away. Its carboxylate group gives it a mild pH and reduces irritation potential compared to sulfate-based cleansers.
Is Sodium C9-11 Pareth-6 Carboxylate safe for most people?
Sodium C9-11 Pareth-6 Carboxylate is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential, making it a good choice for sensitive skin. However, as with any surfactant, individual reactions are possible.
Who should be careful with Sodium C9-11 Pareth-6 Carboxylate?
Individuals seeking 100% natural or plant-derived ingredients only
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.