Ingredient review
C12-13 Pareth-12 Carboxylic Acid
INCI: C12-13 PARETH-12 CARBOXYLIC ACID
A gentle, semi-synthetic surfactant that effectively cleanses without over-drying, making it a good choice for sensitive skin.
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 is made from natural fatty alcohols (from coconut or palm oil) and ethylene oxide, then modified to be less irritating than traditional soaps. It is commonly used in gentle cleansers and makeup removers.
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
C12-13 Pareth-12 Carboxylic Acid 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 C12-13 Pareth-12 Carboxylic Acid.
- 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 semi-synthetic surfactant (cleansing agent) from the alkyl ether carboxylate family, created by reacting fatty alcohols with ethylene oxide and then adding a carboxylic acid group.
How it works
It reduces the surface tension between water and oil, allowing oils and dirt to be lifted from the skin and suspended in water for easy rinsing. Its carboxylate group makes it milder than many other surfactants.
Pros
Mild on skin
Its carboxylate structure makes it significantly less irritating than traditional sulfates like SLS, so it cleanses without leaving skin feeling tight or dry.
Good foam quality
Produces a rich, creamy lather that feels pleasant during cleansing, making it a popular choice for luxury and sensitive-skin cleansers.
Cons and cautions
Potential processing impurities
As an ethoxylated ingredient, it may contain trace amounts of 1,4-dioxane if not properly purified during manufacturing. Reputable brands ensure low levels.
Sustainability concerns
Often derived from palm oil, which can be linked to deforestation. Look for RSPO-certified or sustainably sourced versions.
Best for
- People with normal to dry skin
- Those with sensitive or easily irritated skin
- Anyone looking for a sulfate-free cleanser
Use caution if
- Individuals with known allergies to ethoxylated ingredients (rare)
- Those seeking 100% natural or plant-derived only products
Usage tips
Safety summary
Generally recognized as safe for cosmetic use at typical concentrations. The main concern is trace 1,4-dioxane from ethoxylation, but good manufacturing practices keep levels well below safety limits. Irritation potential is low.
Research notes
Alkyl ether carboxylates have been studied for mildness and are shown to be less irritating than traditional anionic surfactants. They are well-tolerated in repeated patch tests and clinical use.
Common label clues
- Typical concentration
- 1-10% in rinse-off products; lower in leave-on products
- Regulatory status
- Approved for use in cosmetics in the EU, US, and other major markets. The Cosmetic Ingredient Review (CIR) panel has evaluated similar alkyl ether carboxylates and found them safe as used.
- Common uses
- Facial cleansers, Body washes, Shampoos, Makeup removers
- Environmental note
- Biodegradable under standard conditions, but sourcing of palm oil derivatives can impact rainforests. Opt for products from brands committed to sustainable palm oil or alternative feedstocks.
Good to know
- This ingredient is often listed as 'C12-13 Pareth-12 Carboxylic Acid' on labels; it may also appear as part of a surfactant blend.
- It is considered biodegradable and is commonly used in 'sulfate-free' formulations.
Common questions
What is C12-13 Pareth-12 Carboxylic Acid 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 is made from natural fatty alcohols (from coconut or palm oil) and ethylene oxide, then modified to be less irritating than traditional soaps. It is commonly used in gentle cleansers and makeup removers.
What does C12-13 Pareth-12 Carboxylic Acid do in a beauty product?
It reduces the surface tension between water and oil, allowing oils and dirt to be lifted from the skin and suspended in water for easy rinsing. Its carboxylate group makes it milder than many other surfactants.
Is C12-13 Pareth-12 Carboxylic Acid safe for most people?
Generally recognized as safe for cosmetic use at typical concentrations. The main concern is trace 1,4-dioxane from ethoxylation, but good manufacturing practices keep levels well below safety limits. Irritation potential is low.
Who should be careful with C12-13 Pareth-12 Carboxylic Acid?
Individuals with known allergies to ethoxylated ingredients (rare) Those seeking 100% natural or plant-derived only products
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.