Ingredient review
Sodium C12-13 Pareth-12 Carboxylate
INCI: SODIUM C12-13 PARETH-12 CARBOXYLATE
A gentle, semi-synthetic surfactant that cleanses effectively while being less likely to irritate 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 harsher cleansers, it tends not to strip 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 C12-13 Pareth-12 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 C12-13 Pareth-12 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 C12-13 Pareth-12 Carboxylate is a semi-synthetic surfactant, meaning it's a cleansing agent created by combining natural fatty alcohols with ethylene oxide and then converting the end into a carboxylate salt. The 'C12-13' refers to the length of the carbon chain (12 to 13 carbons), and 'pareth-12' indicates about 12 ethylene oxide units. This structure gives it both water-loving and oil-loving properties, allowing it to lift away impurities.
How it works
In a cosmetic product, this molecule arranges itself around oil droplets and dirt particles, with its oil-loving tail grabbing onto grime and its water-loving head pulling it into the rinse water. Because it's a carboxylate (a salt of a carboxylic acid), it's less aggressive than sulfate-based surfactants like SLS or SLES. It creates a moderate foam and leaves skin feeling clean but not tight or dry.
Pros
Mild on skin
Its large, gentle molecular structure means it cleans without stripping the skin's natural oils, reducing the risk of dryness or irritation.
Sulfate-free option
Provides effective cleansing without sodium lauryl sulfate (SLS) or sodium laureth sulfate (SLES), making it a good choice for sensitive scalps and skin.
Cons and cautions
Lower foam
Produces less foam than traditional sulfates, which some users may perceive as less effective, though it still cleans well.
Ethoxylation concerns
As an ethoxylated ingredient, it may contain trace amounts of 1,4-dioxane, a potential contaminant. Reputable manufacturers purify to remove this.
Best for
- People with dry or sensitive skin
- Those looking for a sulfate-free cleanser
Use caution if
- Individuals with known allergies to ethoxylated ingredients (rare)
Usage tips
Safety summary
Generally recognized as safe for use in cosmetics at typical concentrations. The main safety consideration is the potential presence of 1,4-dioxane, a byproduct of ethoxylation. However, reputable cosmetic manufacturers use purification steps to keep levels well below safety limits (e.g., under 10 ppm in the US). Skin irritation and allergy are rare.
Research notes
Studies on similar ethoxylated carboxylates show they are significantly milder than SLS in skin irritation tests (e.g., Zein test, Red Blood Cell test). The Cosmetic Ingredient Review (CIR) panel has reviewed related alkyl carboxylates and found them safe as used. Direct studies on this specific compound are limited, but its chemical class is well-characterized.
Common label clues
- Typical concentration
- 1–10% in rinse-off products; lower in leave-on formulas
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions. The EU CosIng database lists it as a surfactant and cleansing agent. Manufacturers must ensure low levels of 1,4-dioxane per good manufacturing practices.
- Common uses
- Facial cleansers, Body washes, Shampoos, Micellar waters
- Environmental note
- Biodegradable under standard conditions, but the ethoxylation process uses petroleum-derived ethylene oxide. Sourcing of fatty alcohols from sustainable palm or coconut oil can reduce environmental impact.
Good to know
- Often listed as 'Sodium C12-13 Pareth-12 Carboxylate' on ingredient labels.
- Commonly found in 'sulfate-free' and 'gentle' formulations.
- The '12' in 'pareth-12' indicates the average number of ethylene oxide units, which influences its mildness.
Common questions
What is Sodium C12-13 Pareth-12 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 harsher cleansers, it tends not to strip your skin's natural moisture barrier, making it a popular choice for sensitive or dry skin formulas.
What does Sodium C12-13 Pareth-12 Carboxylate do in a beauty product?
In a cosmetic product, this molecule arranges itself around oil droplets and dirt particles, with its oil-loving tail grabbing onto grime and its water-loving head pulling it into the rinse water. Because it's a carboxylate (a salt of a carboxylic acid), it's less aggressive than sulfate-based surfactants like SLS or SLES. It creates a moderate foam and leaves skin feeling clean but not tight or dry.
Is Sodium C12-13 Pareth-12 Carboxylate safe for most people?
Generally recognized as safe for use in cosmetics at typical concentrations. The main safety consideration is the potential presence of 1,4-dioxane, a byproduct of ethoxylation. However, reputable cosmetic manufacturers use purification steps to keep levels well below safety limits (e.g., under 10 ppm in the US). Skin irritation and allergy are rare.
Who should be careful with Sodium C12-13 Pareth-12 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.