Ingredient review
Laureth-11 Carboxylic Acid
INCI: LAURETH-11 CARBOXYLIC ACID
A gentle, non-stripping surfactant that effectively cleanses while being kinder to the skin barrier than traditional sulfates.
In plain English
Laureth-11 carboxylic acid is a mild cleansing ingredient often used in soaps and shampoos. It helps lift dirt and oil from your skin and hair without causing the tight, dry feeling that harsher cleansers can leave behind. Think of it as a gentle cleaner that respects your skin's natural moisture barrier.
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-11 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-11 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 effective at removing impurities.
How it works
In a cosmetic product, laureth-11 carboxylic acid works by reducing the surface tension between water and oil. This allows water to mix with and rinse away sebum, makeup, and dirt. Its mildness comes from its large, gentle molecular structure, which is less likely to penetrate and irritate the skin compared to smaller, harsher surfactants.
Pros
Gentle on skin
Unlike sodium lauryl sulfate, laureth-11 carboxylic acid cleanses without stripping the skin's natural oils, making it ideal for daily use on sensitive or dry skin.
Effective cleanser
It removes dirt, oil, and makeup efficiently, so you don't need to scrub hard or use multiple products to feel clean.
Cons and cautions
Potential contaminant concern
As an ethoxylated ingredient, it may contain trace amounts of 1,4-dioxane if not properly refined. Reputable brands ensure purification to safe levels.
Sustainability questions
The lauryl alcohol source is often palm oil, which can be linked to deforestation. Look for RSPO-certified or sustainably sourced versions.
Best for
- People with dry or sensitive skin looking for a gentle cleanser
- Those who prefer sulfate-free or mild cleansing products
Use caution if
- Individuals with known allergies to ethoxylated ingredients (rare)
Usage tips
Safety summary
Laureth-11 carboxylic acid is considered 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 manufacturers use purification steps to keep levels well below safety limits. Overall, it is a low-irritant, low-comedogenic ingredient suitable for most skin types.
Research notes
Research on ether carboxylic acids like laureth-11 carboxylic acid shows they are significantly milder than traditional anionic surfactants such as SLS. Studies indicate they cause less protein denaturation and skin barrier disruption. While direct studies on this specific chain length are limited, the broader class is well-documented for gentle cleansing.
Common label clues
- Typical concentration
- 1–10% in rinse-off products; lower in leave-on formulas
- Regulatory status
- Approved for use in cosmetics by the FDA and EU Cosmetic Regulation. The Cosmetic Ingredient Review (CIR) panel has deemed similar ethoxylated surfactants safe when formulated to minimize 1,4-dioxane.
- Common uses
- Cleansers, Shampoos, Body washes, Facial washes
- Environmental note
- This ingredient is biodegradable, but its production involves ethoxylation, which requires energy and can generate byproducts. Sourcing from sustainable palm or coconut oil can reduce environmental impact.
Good to know
- Laureth-11 carboxylic acid is part of a family of ether carboxylic acids known for their mildness and compatibility with other ingredients.
- It is often used in 'sulfate-free' formulations as a primary or secondary surfactant.
Common questions
What is Laureth-11 Carboxylic Acid in beauty products?
Laureth-11 carboxylic acid is a mild cleansing ingredient often used in soaps and shampoos. It helps lift dirt and oil from your skin and hair without causing the tight, dry feeling that harsher cleansers can leave behind. Think of it as a gentle cleaner that respects your skin's natural moisture barrier.
What does Laureth-11 Carboxylic Acid do in a beauty product?
In a cosmetic product, laureth-11 carboxylic acid works by reducing the surface tension between water and oil. This allows water to mix with and rinse away sebum, makeup, and dirt. Its mildness comes from its large, gentle molecular structure, which is less likely to penetrate and irritate the skin compared to smaller, harsher surfactants.
Is Laureth-11 Carboxylic Acid safe for most people?
Laureth-11 carboxylic acid is considered 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 manufacturers use purification steps to keep levels well below safety limits. Overall, it is a low-irritant, low-comedogenic ingredient suitable for most skin types.
Who should be careful with Laureth-11 Carboxylic Acid?
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.