Ingredient review
Sodium Laureth-3 Carboxylate
INCI: SODIUM LAURETH-3 CARBOXYLATE
A gentle, soap-free cleanser that effectively removes impurities while being kind to sensitive skin.
In plain English
Sodium Laureth-3 Carboxylate is a mild cleansing ingredient made from coconut oil. It helps water mix with oil and dirt so they can be rinsed away, but it's much gentler than traditional soaps or harsh detergents. Think of it as a soft sponge that lifts away makeup and grime without stripping 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
Sodium Laureth-3 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 Laureth-3 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 (cleansing agent) produced by ethoxylating lauryl alcohol from coconut oil and then carboxylating it. It belongs to the alkyl carboxylate family and is known for its mildness.
How it works
It reduces the surface tension between water and oil, allowing oily dirt and sebum to be emulsified and rinsed away. Its large molecular structure makes it less penetrating and less irritating than smaller surfactants like sodium lauryl sulfate.
Pros
Very gentle on skin
Unlike harsh sulfates, this surfactant has a low irritation potential and won't strip your skin's natural oils, making it ideal for daily use even on sensitive or eczema-prone skin.
Maintains moisture balance
Because it cleans without disrupting the skin barrier, your skin feels soft and hydrated after washing rather than tight or dry.
Cons and cautions
Less effective on heavy makeup
If you wear long-wear or waterproof makeup, you may need a double-cleansing routine or a stronger first cleanser to fully remove everything.
Potential trace impurities
As an ethoxylated ingredient, it may contain trace amounts of 1,4-dioxane, a byproduct. However, reputable manufacturers purify their ingredients to meet safety limits set by regulators.
Best for
- People with dry or sensitive skin looking for a non-stripping cleanser
- Those who prefer sulfate-free or soap-free cleansing products
Use caution if
- Individuals with known allergies to coconut-derived ingredients (rare)
Usage tips
Safety summary
Sodium Laureth-3 Carboxylate is considered safe for use in cosmetics. It has low skin irritation and sensitization potential. The main safety consideration is the potential presence of 1,4-dioxane, but levels are strictly controlled by manufacturers and regulators to be within safe limits.
Research notes
Research on alkyl carboxylates like Sodium Laureth-3 Carboxylate indicates they are mild surfactants with good skin compatibility. Studies show they cause less barrier disruption than sodium lauryl sulfate. The Cosmetic Ingredient Review has deemed similar ingredients safe for rinse-off products.
Common label clues
- Typical concentration
- 1% to 10%
- Regulatory status
- Approved for use in cosmetics by the FDA and the European Commission. The Cosmetic Ingredient Review (CIR) panel has reviewed similar alkyl carboxylates and found them safe at typical use concentrations.
- Common uses
- Facial cleansers, Body washes, Shampoos, Makeup removers
- Environmental note
- This ingredient is derived from renewable coconut oil and is biodegradable, making it a more sustainable choice compared to petroleum-based surfactants.
Good to know
- Sodium Laureth-3 Carboxylate is often found in 'sulfate-free' cleansers.
- It is biodegradable and considered environmentally friendlier than some traditional surfactants.
Common questions
What is Sodium Laureth-3 Carboxylate in beauty products?
Sodium Laureth-3 Carboxylate is a mild cleansing ingredient made from coconut oil. It helps water mix with oil and dirt so they can be rinsed away, but it's much gentler than traditional soaps or harsh detergents. Think of it as a soft sponge that lifts away makeup and grime without stripping your skin's natural moisture barrier.
What does Sodium Laureth-3 Carboxylate do in a beauty product?
It reduces the surface tension between water and oil, allowing oily dirt and sebum to be emulsified and rinsed away. Its large molecular structure makes it less penetrating and less irritating than smaller surfactants like sodium lauryl sulfate.
Is Sodium Laureth-3 Carboxylate safe for most people?
Sodium Laureth-3 Carboxylate is considered safe for use in cosmetics. It has low skin irritation and sensitization potential. The main safety consideration is the potential presence of 1,4-dioxane, but levels are strictly controlled by manufacturers and regulators to be within safe limits.
Who should be careful with Sodium Laureth-3 Carboxylate?
Individuals with known allergies to coconut-derived 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.