Ingredient review
Potassium Trideceth-6 Phosphate
INCI: POTASSIUM TRIDECETH-6 PHOSPHATE
A mild synthetic surfactant that helps cleanse without stripping the skin, often used in gentle formulas.
In plain English
Potassium Trideceth-6 Phosphate is a man-made ingredient that helps water and oil mix together in skincare products. It works as a gentle cleanser that lifts dirt and makeup from the skin without leaving it feeling tight or dry. Think of it as a helper that makes cleansers and lotions feel smooth and rinse off easily.
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
- synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Potassium Trideceth-6 Phosphate 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-6 Phosphate.
- 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 synthetic phosphate ester surfactant derived from tridecyl alcohol and ethylene oxide, neutralized with potassium. It belongs to a class of mild cleansing agents known for their ability to emulsify oils and suspend dirt.
How it works
It reduces the surface tension between oil and water, allowing them to blend into a stable mixture. In cleansers, it surrounds oil and dirt particles so they can be rinsed away with water. In lotions, it helps keep the formula from separating.
Pros
Mild on skin
Unlike harsher sulfates, this surfactant cleans without stripping the skin's natural moisture barrier, making it suitable for daily use.
Versatile formulator
It works well in both rinse-off cleansers and leave-on emulsions, helping create stable, cosmetically elegant products.
Cons and cautions
Synthetic origin
It is manufactured through chemical processes, which may be a drawback for consumers seeking exclusively natural or plant-derived ingredients.
Potential for irritation at high levels
While generally mild, very high concentrations (above 5%) could cause slight irritation for those with extremely sensitive or compromised skin.
Best for
- People with normal to combination skin looking for a mild cleanser
- Those who prefer sulfate-free cleansing options
Use caution if
- Individuals with known sensitivity to phosphate esters or ethoxylated ingredients
Usage tips
Safety summary
Potassium Trideceth-6 Phosphate is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic profile, though individuals with extreme sensitivity should patch test.
Research notes
Limited independent studies specifically on this ingredient, but it is structurally similar to other mild phosphate ester surfactants that have been reviewed as safe by cosmetic ingredient safety panels.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions. No specific restrictions at typical concentrations.
- Common uses
- Cleansers, Makeup removers, Serums, Lotions
- Environmental note
- As a synthetic surfactant, its biodegradability varies. Some ethoxylated compounds may raise environmental concerns, but this ingredient is generally considered low-risk in rinse-off products.
Good to know
- It is often used in combination with other mild surfactants to boost cleansing power while keeping the formula gentle.
- The 'trideceth' part indicates it contains ethoxylated chains, which are processed with ethylene oxide.
Common questions
What is Potassium Trideceth-6 Phosphate in beauty products?
Potassium Trideceth-6 Phosphate is a man-made ingredient that helps water and oil mix together in skincare products. It works as a gentle cleanser that lifts dirt and makeup from the skin without leaving it feeling tight or dry. Think of it as a helper that makes cleansers and lotions feel smooth and rinse off easily.
What does Potassium Trideceth-6 Phosphate do in a beauty product?
It reduces the surface tension between oil and water, allowing them to blend into a stable mixture. In cleansers, it surrounds oil and dirt particles so they can be rinsed away with water. In lotions, it helps keep the formula from separating.
Is Potassium Trideceth-6 Phosphate safe for most people?
Potassium Trideceth-6 Phosphate is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic profile, though individuals with extreme sensitivity should patch test.
Who should be careful with Potassium Trideceth-6 Phosphate?
Individuals with known sensitivity to phosphate esters or ethoxylated ingredients
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.