Ingredient review
Sodium Trideceth-7 Carboxylate
INCI: SODIUM TRIDECETH-7 CARBOXYLATE
A gentle, effective surfactant that cleanses without stripping the skin barrier, making it a good choice for sensitive or dry skin.
In plain English
Sodium Trideceth-7 Carboxylate is a mild cleansing ingredient that helps water mix with oil and dirt so they can be rinsed away. It is less harsh than traditional soaps and leaves skin feeling soft rather than 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
Sodium Trideceth-7 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-7 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 a fatty alcohol (tridecyl alcohol) with ethylene oxide and then converting it into a carboxylate salt. It belongs to the class of ether carboxylates, known for their mildness and good foaming properties.
How it works
It reduces the surface tension between water and oil, allowing oils and dirt on the skin to be emulsified and washed away. Its large molecular structure makes it less penetrating and less irritating than smaller surfactants, so it cleanses gently without disrupting the skin's natural moisture barrier.
Pros
Very gentle on skin
Its large molecular structure means it stays on the surface and doesn't penetrate, reducing the risk of irritation and dryness.
Effective cleanser
It removes oil, dirt, and makeup efficiently while leaving skin feeling soft and hydrated, not tight.
Cons and cautions
Semi-synthetic origin
Made from petrochemical-derived ethylene oxide, which may be a concern for those seeking fully natural formulations.
Potential for slight dryness at high levels
In very high concentrations (above 10%), it can still cause some dryness, though much less than traditional sulfates.
Best for
- People with sensitive or easily irritated skin
- Those looking for a gentle daily cleanser that doesn't strip the skin
Use caution if
- Individuals seeking 100% natural or organic ingredients only
- Those with known allergies to ethoxylated compounds (rare)
Usage tips
Safety summary
Sodium Trideceth-7 Carboxylate is considered safe for use in cosmetics at typical concentrations. It has low irritation and sensitization potential, making it suitable for sensitive skin. No significant safety concerns have been raised by regulatory bodies.
Research notes
Research on ether carboxylates, including Sodium Trideceth-7 Carboxylate, indicates they are among the mildest surfactants available, with minimal impact on skin barrier function. Studies show they cause less protein denaturation and lipid extraction compared to sodium lauryl sulfate.
Common label clues
- Typical concentration
- 1% to 10% in rinse-off products; lower in leave-on products
- Regulatory status
- Approved for use in cosmetics in the EU, US, and most other regions. Generally recognized as safe when used as directed.
- Common uses
- Facial cleansers, Body washes, Shampoos, Makeup removers
- Environmental note
- Ethoxylated surfactants can have moderate biodegradability; however, Sodium Trideceth-7 Carboxylate is considered less persistent than some other ethoxylates.
Good to know
- Often used in 'sulfate-free' cleansers as a primary or secondary surfactant.
- The 'trideceth-7' part indicates it has an average of 7 ethylene oxide units, which contributes to its mildness.
Common questions
What is Sodium Trideceth-7 Carboxylate in beauty products?
Sodium Trideceth-7 Carboxylate is a mild cleansing ingredient that helps water mix with oil and dirt so they can be rinsed away. It is less harsh than traditional soaps and leaves skin feeling soft rather than tight or dry.
What does Sodium Trideceth-7 Carboxylate do in a beauty product?
It reduces the surface tension between water and oil, allowing oils and dirt on the skin to be emulsified and washed away. Its large molecular structure makes it less penetrating and less irritating than smaller surfactants, so it cleanses gently without disrupting the skin's natural moisture barrier.
Is Sodium Trideceth-7 Carboxylate safe for most people?
Sodium Trideceth-7 Carboxylate is considered safe for use in cosmetics at typical concentrations. It has low irritation and sensitization potential, making it suitable for sensitive skin. No significant safety concerns have been raised by regulatory bodies.
Who should be careful with Sodium Trideceth-7 Carboxylate?
Individuals seeking 100% natural or organic ingredients only Those with known allergies to ethoxylated compounds (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.