Ingredient review
Nonyl Nonoxynol-15 Phosphate
INCI: Nonyl Nonoxynol-15 Phosphate
A synthetic emulsifier that helps mix oil and water, but may be drying or irritating for sensitive skin.
In plain English
Nonyl Nonoxynol-15 Phosphate is a man-made ingredient that helps oil and water blend together in products like cleansers and shampoos. It works as a surfactant, meaning it helps lift dirt and oil from your skin so they can be rinsed away. While effective, it can be a bit harsh for very sensitive or dry skin because it can strip natural oils.
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-15 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-15 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 commonly used in rinse-off cosmetic products to help disperse oils and improve foaming.
How it works
It reduces the surface tension between oil and water, allowing them to mix. In a cleanser, it helps break down sebum and makeup so they can be washed away easily. It also helps stabilize emulsions, keeping the product texture consistent.
Pros
Effective cleanser
Helps dissolve oil, makeup, and sunscreen so they rinse away cleanly without leaving residue.
Stable emulsifier
Keeps oil and water mixed in a product, preventing separation and ensuring consistent texture.
Cons and cautions
Potential irritation
Can strip the skin's natural moisture barrier if used too frequently or in high concentrations, leading to dryness or tightness.
Synthetic origin
Not biodegradable or plant-derived, which may be a concern for environmentally conscious consumers.
Best for
- People with oily or combination skin
- Those who use rinse-off cleansers and want effective oil removal
Use caution if
- People with very dry or sensitive skin
- Those who prefer sulfate-free or all-natural formulas
Usage tips
Safety summary
Generally safe for occasional use in rinse-off products. However, it can be drying or irritating for sensitive skin types. Avoid contact with eyes. Not recommended for leave-on products.
Research notes
Limited peer-reviewed studies specific to this ingredient. Broader research on nonoxynol surfactants indicates low acute toxicity but potential for skin irritation at high concentrations. Cosmetic ingredient safety panels (e.g., CIR) have reviewed similar compounds and found them safe when formulated correctly.
Common label clues
- Typical concentration
- Usually 0.5% to 5% in rinse-off products
- Regulatory status
- Approved for use in cosmetics in the US (FDA) and EU (CosIng) at typical concentrations. Not restricted, but formulators must ensure low irritation potential.
- Common uses
- Cleansers, Shampoos, Body washes, Makeup removers
- Environmental note
- Synthetic surfactants like this one may have low biodegradability. Some regions have restrictions on certain nonoxynol compounds due to aquatic toxicity concerns.
Good to know
- This ingredient is part of the nonoxynol family, which has been used in cosmetics for decades.
- It is not the same as nonoxynol-9, which is used in spermicides and has different properties.
Common questions
What is Nonyl Nonoxynol-15 Phosphate in beauty products?
Nonyl Nonoxynol-15 Phosphate is a man-made ingredient that helps oil and water blend together in products like cleansers and shampoos. It works as a surfactant, meaning it helps lift dirt and oil from your skin so they can be rinsed away. While effective, it can be a bit harsh for very sensitive or dry skin because it can strip natural oils.
What does Nonyl Nonoxynol-15 Phosphate do in a beauty product?
It reduces the surface tension between oil and water, allowing them to mix. In a cleanser, it helps break down sebum and makeup so they can be washed away easily. It also helps stabilize emulsions, keeping the product texture consistent.
Is Nonyl Nonoxynol-15 Phosphate safe for most people?
Generally safe for occasional use in rinse-off products. However, it can be drying or irritating for sensitive skin types. Avoid contact with eyes. Not recommended for leave-on products.
Who should be careful with Nonyl Nonoxynol-15 Phosphate?
People with very dry or sensitive skin Those who prefer sulfate-free or all-natural formulas
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.