Ingredient review
Potassium Laureth-6 Carboxylate
INCI: POTASSIUM LAURETH-6 CARBOXYLATE
A gentle, low-irritation surfactant that effectively cleanses without stripping the skin's natural moisture barrier.
In plain English
Potassium Laureth-6 Carboxylate is a mild cleansing ingredient that helps water mix with oil and dirt so they can be rinsed away. It's made from lauric acid (found in coconut or palm oil) and ethylene oxide, making it a semi-synthetic surfactant. Unlike harsher cleansers like sodium lauryl sulfate, this one is known for being gentle on the skin and eyes, which is why you'll often find it in products for sensitive skin or babies. It creates a nice foam but doesn't leave skin feeling tight or dry.
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
Potassium Laureth-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 Potassium Laureth-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 semi-synthetic surfactant from the carboxylate family, produced by reacting lauric acid with ethylene oxide and then converting it to a potassium salt. It is a mild anionic surfactant that cleanses without over-drying.
How it works
It reduces the surface tension between water and oil, allowing dirt, sebum, and makeup to be emulsified and rinsed away. Its mildness comes from its large, gentle molecular structure that doesn't penetrate or irritate the skin barrier as deeply as smaller, harsher surfactants.
Pros
Very gentle on skin
Unlike harsher sulfates, this surfactant cleanses without stripping natural oils, making it ideal for dry or sensitive skin types.
Low irritation for eyes
It is often used in tear-free baby shampoos and gentle facial cleansers because it causes minimal stinging or irritation around the eyes.
Cons and cautions
Potential palm oil sourcing
Lauric acid is commonly sourced from palm or coconut oil. If from palm, it may raise environmental concerns unless certified sustainable.
Trace impurity risk from manufacturing
As an ethoxylated ingredient, it may contain trace amounts of 1,4-dioxane, a potential contaminant. Reputable manufacturers purify to safe levels.
Best for
- People with dry or sensitive skin
- Those looking for a sulfate-free cleanser
- Parents choosing baby-friendly washes
Use caution if
- Individuals with known allergies to ethoxylated ingredients (rare)
- Those strictly avoiding all palm-derived ingredients
Usage tips
Safety summary
Potassium Laureth-6 Carboxylate is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic risk. The main safety consideration is the potential for trace 1,4-dioxane during manufacturing, but reputable suppliers purify the ingredient to meet safety standards. It is not a known allergen or endocrine disruptor.
Research notes
Research on this specific surfactant is limited, but it belongs to the well-studied class of alkyl ether carboxylates, which are known for their mildness and low skin irritation. Studies on similar carboxylates show they are less damaging to skin barrier function compared to traditional sulfates. No significant safety concerns have been raised by regulatory bodies.
Common label clues
- Typical concentration
- 1% to 10% in rinse-off products
- Regulatory status
- Approved for use in cosmetics globally, including by the EU CosIng database and the US FDA (as part of generally recognized safe surfactants). Manufacturers must ensure low 1,4-dioxane levels per ICH guidelines.
- Common uses
- Facial cleansers, Body washes, Shampoos, Baby care products
- Environmental note
- Biodegradability is moderate; sourcing from sustainable palm or coconut oil is recommended to reduce environmental impact.
Good to know
- It is considered a 'sulfate-free' surfactant, making it a popular alternative to SLS and SLES.
- The 'Laureth-6' part indicates it contains an average of 6 ethylene oxide units, which contributes to its mildness.
Common questions
What is Potassium Laureth-6 Carboxylate in beauty products?
Potassium Laureth-6 Carboxylate is a mild cleansing ingredient that helps water mix with oil and dirt so they can be rinsed away. It's made from lauric acid (found in coconut or palm oil) and ethylene oxide, making it a semi-synthetic surfactant. Unlike harsher cleansers like sodium lauryl sulfate, this one is known for being gentle on the skin and eyes, which is why you'll often find it in products for sensitive skin or babies. It creates a nice foam but doesn't leave skin feeling tight or dry.
What does Potassium Laureth-6 Carboxylate do in a beauty product?
It reduces the surface tension between water and oil, allowing dirt, sebum, and makeup to be emulsified and rinsed away. Its mildness comes from its large, gentle molecular structure that doesn't penetrate or irritate the skin barrier as deeply as smaller, harsher surfactants.
Is Potassium Laureth-6 Carboxylate safe for most people?
Potassium Laureth-6 Carboxylate is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic risk. The main safety consideration is the potential for trace 1,4-dioxane during manufacturing, but reputable suppliers purify the ingredient to meet safety standards. It is not a known allergen or endocrine disruptor.
Who should be careful with Potassium Laureth-6 Carboxylate?
Individuals with known allergies to ethoxylated ingredients (rare) Those strictly avoiding all palm-derived 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.