Ingredient review
Nonyl Nonoxynol-10 Phosphate
INCI: NONYL NONOXYNOL-10 PHOSPHATE
A synthetic cleansing agent that helps remove dirt and oil, but may be drying or irritating for sensitive skin.
In plain English
This is a man-made ingredient that helps water and oil mix together so they can be rinsed away. It's often used in face washes and shampoos to create a foamy lather and remove excess oil. Because it's a strong cleanser, it can sometimes strip the skin of its natural moisture, especially if you have dry or 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.
Main practical flags: irritation is moderate; clogging risk is low.
- Source
- synthetic
- Evidence
- moderate
- Irritation
- moderate
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Nonyl Nonoxynol-10 Phosphate can be useful, but watch for some irritation potential.
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 Nonyl Nonoxynol-10 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
moderateCan bother some users, especially with frequent use, damaged skin, or strong companion ingredients.
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 nonoxynol, a type of nonionic surfactant. It is designed to lower the surface tension between oil and water, making it effective for cleansing and emulsifying.
How it works
In a cosmetic product, it acts as a surfactant and emulsifier. It surrounds oil and dirt particles, allowing them to be suspended in water and rinsed away. It also helps stabilize mixtures of oil and water in creams and lotions.
Pros
Effective cleanser
Removes excess sebum, makeup, and environmental debris thoroughly, leaving skin feeling clean.
Good emulsifier
Helps create stable, smooth creams and lotions that don't separate, improving product texture and shelf life.
Cons and cautions
Potential irritation
Can cause stinging, redness, or dryness, especially on sensitive or already irritated skin.
May strip moisture
Overuse or high concentrations can remove natural oils, leading to a tight, uncomfortable feeling after washing.
Best for
- People with oily or combination skin looking for a deep cleanse
- Those who tolerate synthetic surfactants well and prefer a foamy cleanser
Use caution if
- Individuals with dry, sensitive, or compromised skin barriers
- Anyone prone to irritation from strong cleansing agents
Usage tips
Safety summary
Generally recognized as safe for use in rinse-off products at typical concentrations. However, it can be irritating to sensitive skin and may cause dryness with frequent use. Avoid contact with eyes.
Research notes
Limited peer-reviewed studies specifically on Nonyl Nonoxynol-10 Phosphate. Related nonoxynol surfactants have been studied for skin irritation potential and environmental impact. More research is needed on long-term topical safety.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the US and EU within concentration limits. Not classified as a restricted ingredient, but formulators must follow good manufacturing practices.
- Common uses
- Cleansers, Facial washes, Emulsions, Shampoos
- Environmental note
- Phosphate-based surfactants may contribute to aquatic nutrient pollution. Biodegradability varies; some nonoxynol derivatives have raised environmental concerns.
Good to know
- Nonoxynol compounds are sometimes used in industrial applications, but cosmetic-grade versions are purified for safety.
- This ingredient is not typically found in 'gentle' or 'non-foaming' cleansers.
Common questions
What is Nonyl Nonoxynol-10 Phosphate in beauty products?
This is a man-made ingredient that helps water and oil mix together so they can be rinsed away. It's often used in face washes and shampoos to create a foamy lather and remove excess oil. Because it's a strong cleanser, it can sometimes strip the skin of its natural moisture, especially if you have dry or sensitive skin.
What does Nonyl Nonoxynol-10 Phosphate do in a beauty product?
In a cosmetic product, it acts as a surfactant and emulsifier. It surrounds oil and dirt particles, allowing them to be suspended in water and rinsed away. It also helps stabilize mixtures of oil and water in creams and lotions.
Is Nonyl Nonoxynol-10 Phosphate safe for most people?
Generally recognized as safe for use in rinse-off products at typical concentrations. However, it can be irritating to sensitive skin and may cause dryness with frequent use. Avoid contact with eyes.
Who should be careful with Nonyl Nonoxynol-10 Phosphate?
Individuals with dry, sensitive, or compromised skin barriers Anyone prone to irritation from strong cleansing agents
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.