Ingredient review
Ceteareth-24
INCI: Ceteareth-24
Ceteareth-24 is a synthetic emulsifier that helps blend oil and water in products, generally considered safe and low-irritation for most skin types.
In plain English
Ceteareth-24 is a man-made ingredient that helps oil and water mix together in your skincare products, so they stay smooth and don't separate. It's a type of emulsifier, similar to how lecithin works in mayonnaise. Because it's made from fatty alcohols and ethylene oxide, it's very gentle on skin and is commonly found in cleansers, lotions, and creams.
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
Ceteareth-24 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-24.
- 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-24 is a polyethylene glycol (PEG) derivative of cetearyl alcohol, a mixture of fatty alcohols from plant or synthetic sources. It belongs to the ceteareth family, where the number 24 indicates the average length of the polyethylene glycol chain. This chain length makes it water-soluble and effective at stabilizing oil-in-water emulsions.
How it works
In a cosmetic product, Ceteareth-24 sits at the boundary between oil and water droplets, reducing surface tension so they can mix into a stable emulsion. This prevents your lotion or cream from separating into watery and oily layers. It also helps cleanse by trapping dirt and oil, allowing them to be rinsed away with water.
Pros
Effective emulsifier
Ceteareth-24 reliably blends oil and water, giving your creams and lotions a consistent, smooth texture that doesn't separate over time.
Low irritation potential
Compared to harsher surfactants like sodium lauryl sulfate, Ceteareth-24 is very gentle on skin and unlikely to cause stinging or dryness, even with regular use.
Cons and cautions
Synthetic origin
It is manufactured through chemical processing, which may not appeal to those seeking natural or minimal-ingredient skincare routines.
Potential trace impurities
The production process can generate trace amounts of 1,4-dioxane, a possible carcinogen, though reputable manufacturers purify to safe levels set by regulators.
Best for
- People with normal to dry skin looking for gentle cleansers
- Anyone using cream-based products who wants a stable, non-separating formula
Use caution if
- Those with known sensitivities to PEG compounds (rare)
- Individuals seeking fully natural or plant-based ingredient lists
Usage tips
Safety summary
Ceteareth-24 is considered safe for use in cosmetics at typical concentrations. The main concern is potential contamination with 1,4-dioxane during manufacturing, but regulatory limits keep levels very low. It has low irritation and comedogenic potential, making it suitable for most skin types.
Research notes
The Cosmetic Ingredient Review (CIR) panel has evaluated ceteareth compounds and found them safe as used in cosmetics. Studies show low skin irritation and sensitization potential. No significant human health risks have been identified from topical use.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics by the U.S. FDA and the European Commission, with concentration limits and purity standards for 1,4-dioxane.
- Common uses
- Cleansers, Lotions, Creams, Shampoos
- Environmental note
- Ceteareth-24 is not readily biodegradable in aquatic environments, so it may persist in water systems after rinsing.
Good to know
- Ceteareth-24 is often used alongside cetearyl alcohol to create a self-emulsifying wax
- The number 24 indicates a longer PEG chain, making it more water-soluble than lower-numbered ceteareths
Common questions
What is Ceteareth-24 in beauty products?
Ceteareth-24 is a man-made ingredient that helps oil and water mix together in your skincare products, so they stay smooth and don't separate. It's a type of emulsifier, similar to how lecithin works in mayonnaise. Because it's made from fatty alcohols and ethylene oxide, it's very gentle on skin and is commonly found in cleansers, lotions, and creams.
What does Ceteareth-24 do in a beauty product?
In a cosmetic product, Ceteareth-24 sits at the boundary between oil and water droplets, reducing surface tension so they can mix into a stable emulsion. This prevents your lotion or cream from separating into watery and oily layers. It also helps cleanse by trapping dirt and oil, allowing them to be rinsed away with water.
Is Ceteareth-24 safe for most people?
Ceteareth-24 is considered safe for use in cosmetics at typical concentrations. The main concern is potential contamination with 1,4-dioxane during manufacturing, but regulatory limits keep levels very low. It has low irritation and comedogenic potential, making it suitable for most skin types.
Who should be careful with Ceteareth-24?
Those with known sensitivities to PEG compounds (rare) Individuals seeking fully natural or plant-based ingredient lists
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.