Ingredient review
Ceteareth-6
INCI: Ceteareth-6
Ceteareth-6 is a gentle emulsifier that helps mix water and oil in your skincare, but it may be contaminated with 1,4-dioxane during manufacturing, so look for purified versions.
In plain English
Ceteareth-6 is a helper ingredient that allows water and oil to blend together smoothly in products like lotions and cleansers. It is made from natural fatty alcohols (from coconut or palm oil) combined with ethylene oxide, which makes it water-friendly. While it is generally mild and safe for most skin types, the manufacturing process can create a trace impurity called 1,4-dioxane, which is a potential carcinogen. Reputable brands purify their ingredients to remove this impurity, so it is considered safe at the low levels found in cosmetics.
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-6 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-6.
- 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-6 is a semi-synthetic emulsifier and surfactant. It belongs to the ceteareth family, which are ethoxylated fatty alcohols. The number '6' indicates the average number of ethylene oxide units attached, which determines its water-loving properties.
How it works
In a cosmetic product, Ceteareth-6 sits at the boundary between oil and water droplets, reducing surface tension so they mix into a stable emulsion. This prevents your lotion or cream from separating into oily and watery layers. It also helps cleanse by lowering the surface tension of water, allowing dirt and oil to be rinsed away more easily.
Pros
Gentle emulsifier
Ceteareth-6 is mild and well-tolerated by most skin types, making it a common choice for daily-use lotions and cleansers.
Improves product feel
It helps create a smooth, creamy texture that spreads easily and feels pleasant on the skin.
Cons and cautions
Potential impurity concern
The ethoxylation process can leave trace amounts of 1,4-dioxane, a possible carcinogen. However, reputable manufacturers purify it to safe levels.
Sustainability issues
Ceteareth-6 is often derived from palm oil, which can be linked to deforestation unless certified sustainable sources are used.
Best for
- People with normal to combination skin looking for gentle cleansers
- Anyone using lotions or creams who wants a stable, non-separating formula
Use caution if
- Individuals with known sensitivity to ethoxylated ingredients or 1,4-dioxane concerns
Usage tips
Safety summary
Ceteareth-6 is considered safe for use in cosmetics at typical concentrations. The main safety concern is trace contamination with 1,4-dioxane during manufacturing, but reputable brands use purification steps to keep levels well below safety limits. It is generally non-irritating and non-comedogenic for most skin types.
Research notes
The Cosmetic Ingredient Review (CIR) panel reviewed ceteareth compounds and concluded they are safe as used in cosmetics when formulated to minimize 1,4-dioxane. Studies show low irritation and sensitization potential. No significant human health risks have been identified from cosmetic use.
Common label clues
- Typical concentration
- 0.5–5%
- 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 when formulated to minimize 1,4-dioxane.
- Common uses
- Cleansers, Lotions, Creams, Conditioners
- Environmental note
- Derived from palm or coconut oil. Look for RSPO-certified palm sources to support sustainable harvesting.
Good to know
- The number in ceteareth names (e.g., -6, -20) indicates the degree of ethoxylation, which affects how water-loving the ingredient is.
- Ceteareth-6 is often used alongside cetearyl alcohol to form a self-emulsifying wax.
- Many natural or 'clean' beauty brands avoid ethoxylated ingredients due to the 1,4-dioxane concern.
Common questions
What is Ceteareth-6 in beauty products?
Ceteareth-6 is a helper ingredient that allows water and oil to blend together smoothly in products like lotions and cleansers. It is made from natural fatty alcohols (from coconut or palm oil) combined with ethylene oxide, which makes it water-friendly. While it is generally mild and safe for most skin types, the manufacturing process can create a trace impurity called 1,4-dioxane, which is a potential carcinogen. Reputable brands purify their ingredients to remove this impurity, so it is considered safe at the low levels found in cosmetics.
What does Ceteareth-6 do in a beauty product?
In a cosmetic product, Ceteareth-6 sits at the boundary between oil and water droplets, reducing surface tension so they mix into a stable emulsion. This prevents your lotion or cream from separating into oily and watery layers. It also helps cleanse by lowering the surface tension of water, allowing dirt and oil to be rinsed away more easily.
Is Ceteareth-6 safe for most people?
Ceteareth-6 is considered safe for use in cosmetics at typical concentrations. The main safety concern is trace contamination with 1,4-dioxane during manufacturing, but reputable brands use purification steps to keep levels well below safety limits. It is generally non-irritating and non-comedogenic for most skin types.
Who should be careful with Ceteareth-6?
Individuals with known sensitivity to ethoxylated ingredients or 1,4-dioxane concerns
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.