Ingredient review
Ceteareth-2 Phosphate
INCI: Ceteareth-2 Phosphate
A gentle emulsifier that helps mix oil and water in cleansers and creams, with a low risk of irritation.
In plain English
Ceteareth-2 Phosphate is a mild cleansing and mixing ingredient. It helps oil and water blend together in products like face washes and lotions, so they feel smooth and rinse off easily. Because it's a phosphate-based surfactant, it's generally less harsh than traditional soap ingredients.
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
- semi synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Ceteareth-2 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 Ceteareth-2 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 semi-synthetic surfactant and emulsifier made by reacting cetearyl alcohol (a fatty alcohol from plant oils) with ethylene oxide and phosphoric acid. It belongs to the class of alkyl ether phosphates, known for their mildness.
How it works
It reduces the surface tension between oil and water, allowing them to mix into a stable emulsion. In cleansers, it helps lift dirt and oil from the skin so they can be rinsed away without stripping the skin's natural moisture barrier.
Pros
Mild on skin
Unlike harsher sulfates, Ceteareth-2 Phosphate cleanses without stripping the skin's natural oils, making it suitable for daily use on sensitive or dry skin.
Versatile formulator
It works well in both rinse-off and leave-on products, helping create smooth, stable emulsions that feel pleasant on the skin.
Cons and cautions
Potential contaminant concern
As an ethoxylated ingredient, trace amounts of 1,4-dioxane can form during manufacturing. However, reputable brands purify their ingredients to meet safety limits set by regulators.
Sustainability questions
The fatty alcohol source may come from palm oil, which has environmental and ethical concerns unless certified sustainable.
Best for
- People with normal to dry skin looking for a gentle cleanser
- Those who prefer mild, non-stripping surfactants in their daily routine
Use caution if
- Individuals with a known allergy to ethoxylated ingredients (rare)
Usage tips
Safety summary
Ceteareth-2 Phosphate is considered safe for use in cosmetics at typical concentrations. The main safety consideration is the potential for trace 1,4-dioxane contamination, which is regulated and minimized by responsible manufacturers. Overall, it poses a low risk of irritation or clogged pores.
Research notes
Alkyl ether phosphates like Ceteareth-2 Phosphate have been reviewed by the Cosmetic Ingredient Review panel and found safe for cosmetic use. Studies indicate they are mild surfactants with low skin irritation potential. No recent high-profile safety concerns have been raised.
Common label clues
- Typical concentration
- 0.5% to 5% of the formula
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions. The Cosmetic Ingredient Review (CIR) panel has reviewed alkyl ether phosphates and found them safe as used.
- Common uses
- Cleansers, Lotions, Creams, Makeup removers
- Environmental note
- Biodegradability is moderate; some alkyl ether phosphates can persist in water systems. Choosing products from brands that prioritize sustainable sourcing can reduce environmental impact.
Good to know
- Ceteareth-2 Phosphate is often used in 'soap-free' cleansers and micellar waters.
- The number '2' refers to the average ethylene oxide units, which influences its water solubility and mildness.
Common questions
What is Ceteareth-2 Phosphate in beauty products?
Ceteareth-2 Phosphate is a mild cleansing and mixing ingredient. It helps oil and water blend together in products like face washes and lotions, so they feel smooth and rinse off easily. Because it's a phosphate-based surfactant, it's generally less harsh than traditional soap ingredients.
What does Ceteareth-2 Phosphate do in a beauty product?
It reduces the surface tension between oil and water, allowing them to mix into a stable emulsion. In cleansers, it helps lift dirt and oil from the skin so they can be rinsed away without stripping the skin's natural moisture barrier.
Is Ceteareth-2 Phosphate safe for most people?
Ceteareth-2 Phosphate is considered safe for use in cosmetics at typical concentrations. The main safety consideration is the potential for trace 1,4-dioxane contamination, which is regulated and minimized by responsible manufacturers. Overall, it poses a low risk of irritation or clogged pores.
Who should be careful with Ceteareth-2 Phosphate?
Individuals with a known allergy to ethoxylated ingredients (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.