Ingredient review
Trideceth-6 Phosphate
INCI: TRIDECETH-6 PHOSPHATE
A gentle synthetic surfactant that helps cleanse without stripping the skin, often used in mild formulas.
In plain English
Trideceth-6 Phosphate is a man-made ingredient that helps water and oil mix together in products like cleansers and lotions. It also helps lift dirt and oil from your skin so they can be rinsed away. Because it's a phosphate-based surfactant, it tends to be milder than traditional sulfates, making it a good choice for sensitive skin.
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
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 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, used primarily as an emulsifier and cleansing agent.
How it works
It reduces the surface tension between oil and water, allowing them to blend into a stable emulsion. In cleansers, it surrounds oil and dirt particles so they can be washed away without over-stripping the skin's natural moisture barrier.
Pros
Mild on skin
Compared to harsher sulfates like SLS, Trideceth-6 Phosphate is less likely to cause dryness or irritation, making it suitable for daily use.
Effective emulsifier
It helps create stable, creamy textures in lotions and cleansers, improving product feel and performance.
Cons and cautions
Synthetic ingredient
It is not naturally derived, which may be a drawback for consumers seeking plant-based or natural formulations.
Potential for mild irritation
Although generally low-risk, some individuals with extremely sensitive or compromised skin may experience slight stinging or redness at higher concentrations.
Best for
- People with normal to combination skin
- Those looking for a sulfate-free cleanser option
Use caution if
- Individuals with known sensitivity to phosphate esters (rare)
Usage tips
Safety summary
Trideceth-6 Phosphate is considered safe for use in cosmetics at typical concentrations. It has low irritation and sensitization potential, though patch testing is recommended for those with very reactive skin.
Research notes
Limited peer-reviewed studies specifically on Trideceth-6 Phosphate, but it is structurally similar to other phosphate esters that have been evaluated as safe by the Cosmetic Ingredient Review (CIR) panel. Its mildness is supported by surfactant chemistry principles.
Common label clues
- Typical concentration
- 0.5–5%
- Regulatory status
- Approved for use in cosmetics by the FDA and EU CosIng database with no specific restrictions at typical concentrations.
- Common uses
- Cleansers, Shampoos, Body washes, Emulsions
- Environmental note
- Phosphate surfactants can contribute to eutrophication in waterways if not properly treated, but Trideceth-6 Phosphate is considered biodegradable under standard conditions.
Good to know
- Often found in 'sulfate-free' shampoos and gentle face washes.
- Phosphate-based surfactants are generally biodegradable.
Common questions
What is Trideceth-6 Phosphate in beauty products?
Trideceth-6 Phosphate is a man-made ingredient that helps water and oil mix together in products like cleansers and lotions. It also helps lift dirt and oil from your skin so they can be rinsed away. Because it's a phosphate-based surfactant, it tends to be milder than traditional sulfates, making it a good choice for sensitive skin.
What does Trideceth-6 Phosphate do in a beauty product?
It reduces the surface tension between oil and water, allowing them to blend into a stable emulsion. In cleansers, it surrounds oil and dirt particles so they can be washed away without over-stripping the skin's natural moisture barrier.
Is Trideceth-6 Phosphate safe for most people?
Trideceth-6 Phosphate is considered safe for use in cosmetics at typical concentrations. It has low irritation and sensitization potential, though patch testing is recommended for those with very reactive skin.
Who should be careful with Trideceth-6 Phosphate?
Individuals with known sensitivity 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.