Ingredient review
Potassium Trideceth-7 Phosphate
INCI: POTASSIUM TRIDECETH-7 PHOSPHATE
A gentle synthetic surfactant that helps cleanse without stripping the skin's natural moisture barrier.
In plain English
Potassium Trideceth-7 Phosphate is a man-made ingredient that helps water and oil mix together in a product. In cleansers, it lifts dirt, makeup, and excess oil from your skin so they can be rinsed away easily. It is considered very mild and less likely to cause dryness or irritation compared to harsher cleansing agents like sodium lauryl sulfate.
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-7 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-7 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 fatty alcohols and ethylene oxide, designed to be a gentle cleansing and emulsifying agent.
How it works
It reduces the surface tension between oil and water, allowing them to blend into a stable emulsion. In a cleanser, it surrounds oil and dirt particles so they can be suspended in water and rinsed off without leaving a residue.
Pros
Gentle on skin
This surfactant is much milder than traditional sulfates, making it a good choice for daily cleansing without causing tightness or irritation.
Versatile formulator
It works well in both rinse-off and leave-on products, helping to stabilize formulas and improve texture.
Cons and cautions
Synthetic origin
As a man-made ingredient, it may not be preferred by those seeking fully natural or organic skincare routines.
Potential processing impurities
The ethoxylation process can create trace amounts of 1,4-dioxane if not properly refined, though reputable manufacturers keep levels well below safety limits.
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 allergies to phosphate esters (rare)
Usage tips
Safety summary
Potassium Trideceth-7 Phosphate is widely regarded as safe for use in cosmetics at typical concentrations. It has low skin irritation and sensitization potential. As with all ethoxylated ingredients, quality control is important to minimize trace impurities, but reputable brands ensure purity.
Research notes
Safety assessments by expert panels (e.g., CIR) have reviewed similar phosphate ester surfactants and found them safe for cosmetic use. Specific studies on Potassium Trideceth-7 Phosphate are limited, but its chemical class is well-documented for mildness and low irritation.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics globally, including by the FDA (USA) and EU CosIng database, with no concentration restrictions for rinse-off products.
- Common uses
- Cleansers, Makeup removers, Facial washes, Body washes
- Environmental note
- This surfactant is generally considered biodegradable, but as a synthetic compound, its production relies on petrochemical feedstocks.
Good to know
- Potassium Trideceth-7 Phosphate is often used in micellar waters and gentle foaming cleansers.
- It is considered biodegradable and has a favorable environmental profile compared to some older surfactants.
Common questions
What is Potassium Trideceth-7 Phosphate in beauty products?
Potassium Trideceth-7 Phosphate is a man-made ingredient that helps water and oil mix together in a product. In cleansers, it lifts dirt, makeup, and excess oil from your skin so they can be rinsed away easily. It is considered very mild and less likely to cause dryness or irritation compared to harsher cleansing agents like sodium lauryl sulfate.
What does Potassium Trideceth-7 Phosphate do in a beauty product?
It reduces the surface tension between oil and water, allowing them to blend into a stable emulsion. In a cleanser, it surrounds oil and dirt particles so they can be suspended in water and rinsed off without leaving a residue.
Is Potassium Trideceth-7 Phosphate safe for most people?
Potassium Trideceth-7 Phosphate is widely regarded as safe for use in cosmetics at typical concentrations. It has low skin irritation and sensitization potential. As with all ethoxylated ingredients, quality control is important to minimize trace impurities, but reputable brands ensure purity.
Who should be careful with Potassium Trideceth-7 Phosphate?
Individuals with known allergies to phosphate esters (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.