Ingredient review
Ceteareth-11
INCI: Ceteareth-11
Ceteareth-11 is a gentle emulsifier that helps create stable, creamy textures in skincare without common irritation.
In plain English
Ceteareth-11 is a mild ingredient that helps oil and water mix together in products like lotions and cleansers. It's made from natural fatty alcohols and ethylene oxide, but the process is carefully controlled to keep it gentle on skin. You'll find it in many creamy or milky formulas where it helps the product feel smooth and spread easily.
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-11 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-11.
- 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
Ceteareth-11 is a semi-synthetic emulsifier derived from cetearyl alcohol (a blend of natural fatty alcohols from coconut or palm oil) and ethylene oxide. It belongs to the ceteareth family of surfactants and is used to stabilize oil-in-water emulsions.
How it works
In a cosmetic product, Ceteareth-11 sits at the boundary between oil and water droplets, reducing surface tension so they stay mixed. This prevents the product from separating into layers and gives it a smooth, uniform texture. It also helps cleanse by lifting dirt and oil from the skin's surface.
Pros
Gentle on skin
Ceteareth-11 has a low irritation risk, making it suitable for daily use in cleansers and moisturizers without stinging or redness.
Improves product texture
It helps create smooth, creamy formulas that feel luxurious and spread easily, enhancing the user experience.
Cons and cautions
Potential trace impurity
During manufacturing, trace amounts of 1,4-dioxane can form. However, reputable brands use purification steps to keep levels well below safety limits.
Not fully natural
As a semi-synthetic ingredient, it may not appeal to those seeking 100% natural or organic skincare products.
Best for
- People with normal to dry skin looking for a stable, creamy moisturizer
- Anyone who prefers mild, non-irritating emulsifiers in their skincare
Use caution if
- Those with known allergies to ethoxylated ingredients (rare)
Usage tips
Safety summary
Ceteareth-11 is considered safe for cosmetic use at typical concentrations. The main concern is potential contamination with 1,4-dioxane, but regulatory limits and purification methods keep levels negligible. It has low irritation and comedogenic risk.
Research notes
The Cosmetic Ingredient Review (CIR) panel reviewed ceteareth compounds and concluded they are safe as used. Studies show low skin irritation and sensitization potential. No significant human health risks have been identified in cosmetic use.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics by the FDA and EU CosIng database. The Cosmetic Ingredient Review (CIR) panel has deemed ceteareth compounds safe as used in rinse-off and leave-on products.
- Common uses
- Cleansers, Moisturizers, Lotions, Creams
- Environmental note
- Ceteareth-11 is not readily biodegradable in all environments, but modern manufacturing reduces its ecological footprint. Some sources use sustainably sourced palm or coconut oil.
Good to know
- Ceteareth-11 is part of a family of emulsifiers with different numbers (e.g., -20, -30) indicating varying degrees of water solubility.
- It is often used in combination with fatty alcohols to create a rich, non-greasy feel.
Common questions
What is Ceteareth-11 in beauty products?
Ceteareth-11 is a mild ingredient that helps oil and water mix together in products like lotions and cleansers. It's made from natural fatty alcohols and ethylene oxide, but the process is carefully controlled to keep it gentle on skin. You'll find it in many creamy or milky formulas where it helps the product feel smooth and spread easily.
What does Ceteareth-11 do in a beauty product?
In a cosmetic product, Ceteareth-11 sits at the boundary between oil and water droplets, reducing surface tension so they stay mixed. This prevents the product from separating into layers and gives it a smooth, uniform texture. It also helps cleanse by lifting dirt and oil from the skin's surface.
Is Ceteareth-11 safe for most people?
Ceteareth-11 is considered safe for cosmetic use at typical concentrations. The main concern is potential contamination with 1,4-dioxane, but regulatory limits and purification methods keep levels negligible. It has low irritation and comedogenic risk.
Who should be careful with Ceteareth-11?
Those with known allergies 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.