Ingredient review
Laureth-6 Carboxylic Acid
INCI: Laureth-6 Carboxylic Acid
A gentle, effective surfactant that cleans without stripping the skin's natural moisture barrier.
In plain English
Laureth-6 Carboxylic Acid is a mild cleansing ingredient that helps water and oil mix so dirt and makeup can be rinsed away easily. Unlike harsher soaps, it is designed to clean without leaving skin feeling tight or dry. It is often used in gentle face washes and micellar waters because it is less likely to cause irritation.
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
Laureth-6 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 Laureth-6 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 made by reacting lauryl alcohol (from coconut or palm oil) with ethylene oxide, then adding a carboxylic acid group. This structure gives it both water-loving and oil-loving properties, making it an effective but mild cleanser.
How it works
In a product, it reduces the surface tension between water and oil, allowing oily dirt and makeup to be lifted off the skin and rinsed away. Its mildness comes from its large, gentle molecular structure, which is less disruptive to the skin's natural barrier compared to traditional sulfates.
Pros
Mild on skin
Its large molecular structure makes it less likely to strip natural oils, so skin stays comfortable after washing.
Effective cleanser
It lifts away oil-based impurities like sunscreen and makeup without requiring harsh scrubbing.
Cons and cautions
Semi-synthetic origin
Made through chemical processing, which may not suit those who prefer entirely natural or unprocessed ingredients.
Potential for mild irritation
In very high concentrations or for extremely sensitive skin, it could still cause slight dryness or tightness.
Best for
- People with normal to dry skin looking for a gentle cleanser
- Those who prefer sulfate-free cleansing options
Use caution if
- Individuals with known allergies to ethoxylated ingredients (rare)
- Those seeking 100% natural or plant-derived-only ingredients
Usage tips
Safety summary
Laureth-6 Carboxylic Acid is considered safe for cosmetic use at typical concentrations. It is a mild surfactant with low irritation and comedogenic potential. As with any ingredient, patch test if you have very reactive skin.
Research notes
Studies on similar ethoxylated carboxylic acids show they are less irritating than traditional sulfates. Specific research on Laureth-6 Carboxylic Acid is limited, but its chemical class is well-documented for mild cleansing.
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. Generally recognized as safe when used as directed.
- Common uses
- Cleansers, Facial washes, Shampoos, Body washes, Micellar waters
- Environmental note
- Derived from plant-based lauryl alcohol, but the ethoxylation process involves synthetic chemistry. Biodegradability is moderate; check product for eco-certifications.
Good to know
- Often listed near the middle of an ingredient list, indicating moderate concentration.
- Commonly found in 'sulfate-free' and 'gentle' cleansing products.
Common questions
What is Laureth-6 Carboxylic Acid in beauty products?
Laureth-6 Carboxylic Acid is a mild cleansing ingredient that helps water and oil mix so dirt and makeup can be rinsed away easily. Unlike harsher soaps, it is designed to clean without leaving skin feeling tight or dry. It is often used in gentle face washes and micellar waters because it is less likely to cause irritation.
What does Laureth-6 Carboxylic Acid do in a beauty product?
In a product, it reduces the surface tension between water and oil, allowing oily dirt and makeup to be lifted off the skin and rinsed away. Its mildness comes from its large, gentle molecular structure, which is less disruptive to the skin's natural barrier compared to traditional sulfates.
Is Laureth-6 Carboxylic Acid safe for most people?
Laureth-6 Carboxylic Acid is considered safe for cosmetic use at typical concentrations. It is a mild surfactant with low irritation and comedogenic potential. As with any ingredient, patch test if you have very reactive skin.
Who should be careful with Laureth-6 Carboxylic Acid?
Individuals with known allergies to ethoxylated ingredients (rare) Those seeking 100% natural or plant-derived-only ingredients
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.