Ingredient review
Potassium Trideceth-19 Carboxylate
INCI: POTASSIUM TRIDECETH-19 CARBOXYLATE
A gentle, effective cleanser that removes impurities without stripping the skin, making it a good choice for sensitive or dry skin types.
In plain English
Potassium Trideceth-19 Carboxylate is a mild cleansing ingredient often used in soaps and washes. It works by helping water mix with oil and dirt so they can be rinsed away easily. Unlike harsher cleansers, it is less likely to leave your skin feeling tight or dry, which is why it is popular in gentle or moisturizing 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
Potassium Trideceth-19 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 Potassium Trideceth-19 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 derived from fatty acids and ethylene oxide, chemically modified to be a carboxylate salt. It belongs to a class of mild cleansing agents known as ether carboxylates.
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 therefore less irritating than smaller surfactant molecules.
Pros
Very gentle on skin
Its large molecular structure means it stays mostly on the skin's surface, reducing irritation and dryness compared to harsher sulfates.
Good for sensitive skin
Often used in formulations designed for eczema-prone or reactive skin because it cleans effectively without disrupting the skin barrier.
Cons and cautions
May require co-surfactants
On its own, it may not produce enough foam or cleansing power for oily skin, so it is often blended with other mild cleansers.
Ethoxylation concerns
As an ethoxylated ingredient, trace amounts of 1,4-dioxane (a potential contaminant) can be present during manufacturing, though levels are strictly regulated.
Best for
- People with dry or sensitive skin looking for a mild cleanser
- Anyone seeking a sulfate-free cleansing option
Use caution if
- Those with known allergies to ethoxylated ingredients (rare)
- Individuals who prefer completely natural or plant-derived surfactants
Usage tips
Safety summary
Considered safe for use in cosmetics at typical concentrations. Low irritation and comedogenic risk. The main safety consideration is the potential for trace 1,4-dioxane contamination, which is well-controlled by quality manufacturing.
Research notes
Ether carboxylates like Potassium Trideceth-19 Carboxylate have been studied for their mildness and are widely used in dermatological cleansers. Published research supports their low irritation potential compared to traditional anionic surfactants.
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 many other regions. Manufacturers must ensure 1,4-dioxane levels are below safety limits (typically <10 ppm).
- Common uses
- Facial cleansers, Body washes, Shampoos, Makeup removers
- Environmental note
- Biodegradability data is limited, but ether carboxylates are generally considered less persistent than some other synthetic surfactants.
Good to know
- This ingredient is often found in 'sulfate-free' cleansers.
- It is compatible with many other surfactants and can help stabilize foam.
Common questions
What is Potassium Trideceth-19 Carboxylate in beauty products?
Potassium Trideceth-19 Carboxylate is a mild cleansing ingredient often used in soaps and washes. It works by helping water mix with oil and dirt so they can be rinsed away easily. Unlike harsher cleansers, it is less likely to leave your skin feeling tight or dry, which is why it is popular in gentle or moisturizing cleansers.
What does Potassium Trideceth-19 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 therefore less irritating than smaller surfactant molecules.
Is Potassium Trideceth-19 Carboxylate safe for most people?
Considered safe for use in cosmetics at typical concentrations. Low irritation and comedogenic risk. The main safety consideration is the potential for trace 1,4-dioxane contamination, which is well-controlled by quality manufacturing.
Who should be careful with Potassium Trideceth-19 Carboxylate?
Those with known allergies to ethoxylated ingredients (rare) Individuals who prefer completely natural or plant-derived surfactants
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.