Ingredient review
Sodium Laureth-16 Carboxylate
INCI: SODIUM LAURETH-16 CARBOXYLATE
A gentle, non-stripping surfactant that effectively cleanses while being kinder to sensitive skin than traditional sulfates.
In plain English
Sodium Laureth-16 Carboxylate is a mild cleansing ingredient that helps water mix with oil and dirt so they can be rinsed away. Unlike harsher detergents like sodium lauryl sulfate, it is less likely to dry out or irritate your skin. It is often used in gentle cleansers and products for sensitive skin.
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-16 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-16 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 made by reacting lauryl alcohol (from coconut or palm oil) with ethylene oxide, then converting it to a carboxylate salt. It belongs to the ether carboxylate family, known for mildness.
How it works
It reduces the surface tension between water and oil, allowing impurities to be lifted from the skin and suspended in water for easy rinsing. Its large molecular structure makes it less penetrating and therefore less irritating than smaller surfactants.
Pros
Mild on skin
Its large molecular structure reduces penetration, making it much less irritating than common sulfates like SLS.
Effective cleanser
Removes dirt, oil, and makeup without leaving a tight or dry feeling, ideal for daily use.
Cons and cautions
Ethoxylation concerns
The manufacturing process uses ethylene oxide, which can leave trace impurities like 1,4-dioxane, though levels are regulated and typically very low.
Not fully natural
As a semi-synthetic ingredient, it may not appeal to those seeking entirely natural or organic formulations.
Best for
- People with dry or sensitive skin
- Those looking for a sulfate-free cleanser
Use caution if
- Individuals with known allergies to ethoxylated ingredients (rare)
Usage tips
Safety summary
Considered safe for cosmetic use at typical concentrations. The main concern is trace 1,4-dioxane from ethoxylation, but regulatory limits keep exposure minimal. Overall, it is a well-tolerated surfactant.
Research notes
Studies show ether carboxylates like this one have low skin irritation and sensitization potential compared to anionic surfactants. Industry safety assessments support its use in rinse-off products.
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 CosIng database. Manufacturers must limit 1,4-dioxane impurities to safe levels (typically under 10 ppm).
- Common uses
- Facial cleansers, Body washes, Shampoos, Makeup removers
- Environmental note
- Derived from plant-based lauryl alcohol, but the ethoxylation process is energy-intensive. Biodegradability is moderate.
Good to know
- Often found in 'sulfate-free' formulas as a gentler alternative.
- The '16' in its name refers to the average number of ethylene oxide units, which contributes to its mildness.
Common questions
What is Sodium Laureth-16 Carboxylate in beauty products?
Sodium Laureth-16 Carboxylate is a mild cleansing ingredient that helps water mix with oil and dirt so they can be rinsed away. Unlike harsher detergents like sodium lauryl sulfate, it is less likely to dry out or irritate your skin. It is often used in gentle cleansers and products for sensitive skin.
What does Sodium Laureth-16 Carboxylate do in a beauty product?
It reduces the surface tension between water and oil, allowing impurities to be lifted from the skin and suspended in water for easy rinsing. Its large molecular structure makes it less penetrating and therefore less irritating than smaller surfactants.
Is Sodium Laureth-16 Carboxylate safe for most people?
Considered safe for cosmetic use at typical concentrations. The main concern is trace 1,4-dioxane from ethoxylation, but regulatory limits keep exposure minimal. Overall, it is a well-tolerated surfactant.
Who should be careful with Sodium Laureth-16 Carboxylate?
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.