Ingredient review

Potassium Trideceth-7 Carboxylate

INCI: POTASSIUM TRIDECETH-7 CARBOXYLATE

A gentle, semi-synthetic surfactant that effectively cleanses without over-drying, making it suitable for sensitive or dry skin types.

beautyskincarecleanser

In plain English

Potassium Trideceth-7 Carboxylate is a mild cleansing ingredient. Think of it as a soap-like molecule that is much kinder to your skin than traditional harsh soaps. It helps water mix with oil and dirt so they can be rinsed away, but it leaves your skin's natural moisture barrier more intact. You'll find it in gentle cleansers and makeup removers that claim to be non-stripping.

Review score

Safety, usefulness, and evidence

4.0Good
4.0/ 5

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
How reviews are scored

Quick decision guide

Useful, but context matters

Potassium 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.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Potassium Trideceth-7 Carboxylate.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. 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

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

A semi-synthetic surfactant created by reacting a fatty alcohol (tridecyl alcohol) with ethylene oxide to form a trideceth chain, then carboxylating it and neutralizing with potassium. It belongs to the class of carboxylate surfactants known for their mildness.

How it works

In a cosmetic product, this molecule has a water-loving head and an oil-loving tail. When you apply the product, the tails grab onto oils and dirt on your skin, while the heads stay in the water. When you rinse, the whole complex washes away, taking impurities with it. Its large molecular structure makes it less penetrating and less irritating than smaller surfactants.

Pros

Very gentle on skin

Its large molecular structure means it doesn't penetrate deeply, reducing irritation and making it ideal for sensitive or compromised skin barriers.

Effective at removing oil and makeup

Despite its mildness, it still efficiently breaks down sebum, sunscreen, and light makeup, so you don't need harsh scrubbing.

Cons and cautions

Semi-synthetic origin

It is produced through chemical processing (ethoxylation and carboxylation), which may be a turn-off for consumers seeking purely natural ingredients.

Potential for slight dryness at high levels

In very high concentrations or with frequent use, it can still remove some natural oils, though much less than traditional sulfates.

Best for

  • People with dry or sensitive skin looking for a non-stripping cleanser
  • Anyone using a gentle, daily facial cleanser or makeup remover

Use caution if

  • Those seeking a completely natural or plant-derived-only ingredient list

Usage tips

Look for it in the first half of the ingredient list for effective cleansing action.
Pair with a moisturizing routine afterward if you have very dry skin, even though it's gentle.
Use in a double-cleansing method: oil cleanser first, then a water-based cleanser containing this ingredient.

Safety summary

Potassium Trideceth-7 Carboxylate is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic risk, making it suitable for most skin types, including sensitive skin. The Cosmetic Ingredient Review (CIR) panel has evaluated similar carboxylate surfactants and found them safe when formulated properly.

Research notes

Research on this specific ingredient is limited, but studies on related carboxylate surfactants confirm their mildness and low irritation potential compared to traditional anionic surfactants like sodium lauryl sulfate. Evidence supports its role as a gentle cleanser in rinse-off products.

Common label clues

Typical concentration
1–10% in rinse-off products; lower in leave-on formulations
Regulatory status
Approved for use in cosmetics in the EU, US, and most major markets. No specific restrictions beyond general cosmetic safety requirements.
Common uses
Facial cleansers, Body washes, Makeup removers, Shampoos
Environmental note
As a semi-synthetic surfactant, its biodegradability is moderate. It is not known to be a significant environmental concern, but ethoxylated ingredients can sometimes contain trace levels of 1,4-dioxane as a byproduct, though levels are tightly regulated.

Good to know

  • It is often used alongside other mild surfactants to boost foam and cleaning power without increasing irritation.
  • The 'trideceth-7' part indicates it has 7 ethylene oxide units, which contribute to its water solubility and mildness.

Common questions

What is Potassium Trideceth-7 Carboxylate in beauty products?

Potassium Trideceth-7 Carboxylate is a mild cleansing ingredient. Think of it as a soap-like molecule that is much kinder to your skin than traditional harsh soaps. It helps water mix with oil and dirt so they can be rinsed away, but it leaves your skin's natural moisture barrier more intact. You'll find it in gentle cleansers and makeup removers that claim to be non-stripping.

What does Potassium Trideceth-7 Carboxylate do in a beauty product?

In a cosmetic product, this molecule has a water-loving head and an oil-loving tail. When you apply the product, the tails grab onto oils and dirt on your skin, while the heads stay in the water. When you rinse, the whole complex washes away, taking impurities with it. Its large molecular structure makes it less penetrating and less irritating than smaller surfactants.

Is Potassium Trideceth-7 Carboxylate safe for most people?

Potassium Trideceth-7 Carboxylate is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic risk, making it suitable for most skin types, including sensitive skin. The Cosmetic Ingredient Review (CIR) panel has evaluated similar carboxylate surfactants and found them safe when formulated properly.

Who should be careful with Potassium Trideceth-7 Carboxylate?

Those seeking a completely natural or plant-derived-only ingredient list

Research sources

Cosmetic Ingredient Review (CIR) - Safety Assessment of Alkyl CarboxylatesOpenPubChem - Potassium Trideceth-7 CarboxylateOpenEuropean Chemicals Agency (ECHA) - Information on ChemicalsOpen

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.