Ingredient review
Ceteareth-30
INCI: Ceteareth-30
Ceteareth-30 is a gentle emulsifier that helps mix oil and water in creams and cleansers, with a low risk of irritation.
In plain English
Ceteareth-30 is a semi-synthetic ingredient made from fatty alcohols and ethylene oxide. It acts like a bridge between oil and water, allowing them to blend into a smooth, stable cream or lotion. It also helps remove dirt and oil from the skin when used in cleansers. Because it's mild, it's commonly found in products for 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.
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-30 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-30.
- 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-30 is a non-ionic surfactant and emulsifier derived from cetearyl alcohol (a mix of fatty alcohols from plant or synthetic sources) and ethylene oxide. It belongs to the ceteareth family, where the number '30' indicates the average length of the polyethylene glycol chain.
How it works
In a cosmetic product, Ceteareth-30 reduces the surface tension between oil and water, allowing them to mix into a stable emulsion. This prevents the product from separating into layers. In cleansers, it helps lift dirt, oil, and makeup from the skin so they can be rinsed away with water.
Pros
Gentle emulsifier
Ceteareth-30 is mild and unlikely to cause irritation, making it suitable for sensitive skin formulations.
Versatile in formulations
It works well in both rinse-off cleansers and leave-on creams, helping maintain product stability and texture.
Cons and cautions
Potential manufacturing concerns
As an ethoxylated ingredient, trace amounts of 1,4-dioxane (a potential contaminant) can form during production, though reputable manufacturers purify it to safe levels.
May feel drying for some
In high concentrations in cleansers, it can strip natural oils, which may be too drying for very dry or compromised skin.
Best for
- People with normal to combination skin
- Those looking for gentle, non-irritating cleansers and moisturizers
Use caution if
- Individuals with known sensitivity to ethoxylated ingredients (rare)
Usage tips
Safety summary
Ceteareth-30 is considered safe for use in cosmetics at typical concentrations. The main safety concern is potential contamination with 1,4-dioxane during manufacturing, but reputable suppliers purify the ingredient to meet safety standards. It has low irritation and comedogenic potential.
Research notes
The Cosmetic Ingredient Review (CIR) panel has evaluated ceteareth compounds and found them safe as used in cosmetics. Studies indicate low skin irritation and sensitization potential. No significant health risks have been identified for topical use.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics by the FDA and EU CosIng database at typical concentrations.
- Common uses
- Cleansers, Lotions, Creams
- Environmental note
- Ceteareth-30 is biodegradable, but its production involves ethylene oxide, which requires careful industrial handling.
Good to know
- Ceteareth-30 is often used alongside cetearyl alcohol to stabilize emulsions
- The number '30' indicates a longer polyethylene glycol chain, which makes it more water-soluble
Common questions
What is Ceteareth-30 in beauty products?
Ceteareth-30 is a semi-synthetic ingredient made from fatty alcohols and ethylene oxide. It acts like a bridge between oil and water, allowing them to blend into a smooth, stable cream or lotion. It also helps remove dirt and oil from the skin when used in cleansers. Because it's mild, it's commonly found in products for sensitive skin.
What does Ceteareth-30 do in a beauty product?
In a cosmetic product, Ceteareth-30 reduces the surface tension between oil and water, allowing them to mix into a stable emulsion. This prevents the product from separating into layers. In cleansers, it helps lift dirt, oil, and makeup from the skin so they can be rinsed away with water.
Is Ceteareth-30 safe for most people?
Ceteareth-30 is considered safe for use in cosmetics at typical concentrations. The main safety concern is potential contamination with 1,4-dioxane during manufacturing, but reputable suppliers purify the ingredient to meet safety standards. It has low irritation and comedogenic potential.
Who should be careful with Ceteareth-30?
Individuals with known sensitivity 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.