Ingredient review
Sodium Trideceth-12 Carboxylate
INCI: SODIUM TRIDECETH-12 CARBOXYLATE
A gentle, semi-synthetic surfactant that effectively cleanses without stripping the skin's natural moisture barrier.
In plain English
Sodium Trideceth-12 Carboxylate is a mild cleansing ingredient that helps water mix with oil and dirt so they can be rinsed away. It is made from a fatty alcohol (from plant or synthetic sources) and ethylene oxide, then converted into a salt form. Unlike harsher soaps, it cleans without leaving skin feeling tight or dry, making it a popular choice for gentle face washes and body cleansers.
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 Trideceth-12 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 Trideceth-12 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
Sodium Trideceth-12 Carboxylate is a surfactant and emulsifier. It belongs to the class of alkyl ether carboxylates, which are known for being milder than traditional sulfates. It is produced by reacting tridecyl alcohol with ethylene oxide (creating trideceth-12) and then carboxylating and neutralizing with sodium.
How it works
In a cosmetic product, this ingredient reduces the surface tension between water and oil, allowing them to blend. When you rinse, it lifts away sebum, makeup, and impurities from the skin's surface. Its large molecular structure makes it less penetrating and less irritating than smaller surfactants, so it cleans gently.
Pros
Mild on skin
Its large molecular structure means it cleans without penetrating deeply, reducing irritation and dryness compared to harsher surfactants like sodium lauryl sulfate.
Good for sensitive skin
Dermatological testing shows low irritation potential, making it suitable for daily use on reactive or compromised skin barriers.
Cons and cautions
Not natural
It is semi-synthetic, derived from petrochemical or plant-based fatty alcohols via ethoxylation, which may not align with clean beauty preferences.
Potential trace contaminant
The manufacturing process can leave trace amounts of 1,4-dioxane, though reputable brands purify to levels well below safety limits.
Best for
- People with dry or sensitive skin looking for a gentle cleanser
- Anyone wanting a sulfate-free cleansing option
- Those who prefer mild, non-stripping face washes
Use caution if
- Individuals strictly avoiding any ethoxylated ingredients
- Those with known allergies to specific fatty alcohols (rare)
Usage tips
Safety summary
Sodium Trideceth-12 Carboxylate is considered safe for cosmetic use at typical concentrations. It has low skin irritation and comedogenic potential. The main safety consideration is the potential presence of 1,4-dioxane, but reputable manufacturers purify to trace levels (below 10 ppm) that pose no health risk.
Research notes
Studies on alkyl ether carboxylates show they are significantly milder than anionic surfactants like SLS. Human repeat insult patch tests confirm low irritation. No peer-reviewed studies specifically on Sodium Trideceth-12 Carboxylate were found, but the broader class is well-characterized in cosmetic science literature.
Common label clues
- Typical concentration
- 1–10% in rinse-off products; lower in leave-on formulations
- Regulatory status
- Approved for use in cosmetics worldwide. In the EU, it is listed under the CosIng database. The US FDA allows its use as a surfactant in rinse-off products. Manufacturers must ensure low 1,4-dioxane levels per ICH guidelines.
- Common uses
- Facial cleansers, Body washes, Shampoos, Makeup removers
- Environmental note
- This ingredient is biodegradable under aerobic conditions, but its ethoxylate chain can persist in aquatic environments. Eco-conscious brands may choose plant-derived versions and monitor purification processes.
Good to know
- Sodium Trideceth-12 Carboxylate is often listed in 'sulfate-free' formulas as a gentler alternative.
- It is approved for use in cosmetics globally, including by the EU and FDA, with no known safety concerns at typical concentrations.
Common questions
What is Sodium Trideceth-12 Carboxylate in beauty products?
Sodium Trideceth-12 Carboxylate is a mild cleansing ingredient that helps water mix with oil and dirt so they can be rinsed away. It is made from a fatty alcohol (from plant or synthetic sources) and ethylene oxide, then converted into a salt form. Unlike harsher soaps, it cleans without leaving skin feeling tight or dry, making it a popular choice for gentle face washes and body cleansers.
What does Sodium Trideceth-12 Carboxylate do in a beauty product?
In a cosmetic product, this ingredient reduces the surface tension between water and oil, allowing them to blend. When you rinse, it lifts away sebum, makeup, and impurities from the skin's surface. Its large molecular structure makes it less penetrating and less irritating than smaller surfactants, so it cleans gently.
Is Sodium Trideceth-12 Carboxylate safe for most people?
Sodium Trideceth-12 Carboxylate is considered safe for cosmetic use at typical concentrations. It has low skin irritation and comedogenic potential. The main safety consideration is the potential presence of 1,4-dioxane, but reputable manufacturers purify to trace levels (below 10 ppm) that pose no health risk.
Who should be careful with Sodium Trideceth-12 Carboxylate?
Individuals strictly avoiding any ethoxylated ingredients Those with known allergies to specific fatty alcohols (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.