Ingredient review
Ceteareth-5
INCI: Ceteareth-5
Ceteareth-5 is a gentle emulsifier that helps keep your lotions and creams smooth and stable, but it may contain trace impurities from its manufacturing process.
In plain English
Ceteareth-5 is a semi-synthetic ingredient made from natural fatty alcohols and ethylene oxide. It acts as a bridge between oil and water, so your moisturizer or cleanser stays mixed and doesn't separate. It also helps cleanse by lowering the surface tension of water, making it easier to rinse away dirt and oil. While generally considered safe, some people prefer to avoid it due to concerns about potential contamination with 1,4-dioxane, a byproduct of the manufacturing process.
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-5 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-5.
- 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-5 is a polyethylene glycol (PEG) ether of cetearyl alcohol. It belongs to a family of emulsifiers that are widely used in cosmetics to create stable oil-in-water emulsions.
How it works
In a formula, Ceteareth-5 positions itself at the interface between oil and water droplets, reducing surface tension so the two phases blend into a smooth, uniform cream or lotion. It also has mild cleansing properties, helping to lift away impurities from the skin.
Pros
Effective emulsifier
Ceteareth-5 reliably keeps oil and water mixed, preventing your product from separating and ensuring consistent performance.
Low irritation potential
It is considered very mild and is unlikely to cause stinging or redness, even for sensitive skin.
Cons and cautions
Potential 1,4-dioxane contamination
As an ethoxylated ingredient, Ceteareth-5 can be contaminated with 1,4-dioxane during manufacturing. Reputable brands purify it to very low levels, but some consumers prefer to avoid it entirely.
Not natural
It is semi-synthetic and processed with ethylene oxide, which may not align with a natural or organic skincare philosophy.
Best for
- People who use conventional moisturizers and cleansers
- Those looking for a stable, well-mixed product texture
Use caution if
- Individuals who strictly avoid PEG compounds or synthetic emulsifiers
- Those with known sensitivity to ethoxylated ingredients
Usage tips
Safety summary
Ceteareth-5 is considered safe for use in cosmetics at typical concentrations. The main safety concern is potential contamination with 1,4-dioxane, but reputable manufacturers purify the ingredient to meet regulatory limits.
Research notes
The Cosmetic Ingredient Review (CIR) panel has reviewed ethoxylated alcohols and concluded they are safe when formulated to be non-irritating. Studies on 1,4-dioxane show it is a potential carcinogen at high doses, but trace levels in cosmetics are not considered a significant risk.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics by the FDA and the European Commission, with concentration limits for 1,4-dioxane impurity.
- Common uses
- Cleansers, Moisturizers, Lotions, Creams
- Environmental note
- Ceteareth-5 is biodegradable, but its production involves ethylene oxide, which is derived from fossil fuels.
Good to know
- The number '5' in Ceteareth-5 refers to the average number of ethylene oxide units in the molecule.
- Ceteareth-5 is often used alongside other emulsifiers to fine-tune texture and stability.
Common questions
What is Ceteareth-5 in beauty products?
Ceteareth-5 is a semi-synthetic ingredient made from natural fatty alcohols and ethylene oxide. It acts as a bridge between oil and water, so your moisturizer or cleanser stays mixed and doesn't separate. It also helps cleanse by lowering the surface tension of water, making it easier to rinse away dirt and oil. While generally considered safe, some people prefer to avoid it due to concerns about potential contamination with 1,4-dioxane, a byproduct of the manufacturing process.
What does Ceteareth-5 do in a beauty product?
In a formula, Ceteareth-5 positions itself at the interface between oil and water droplets, reducing surface tension so the two phases blend into a smooth, uniform cream or lotion. It also has mild cleansing properties, helping to lift away impurities from the skin.
Is Ceteareth-5 safe for most people?
Ceteareth-5 is considered safe for use in cosmetics at typical concentrations. The main safety concern is potential contamination with 1,4-dioxane, but reputable manufacturers purify the ingredient to meet regulatory limits.
Who should be careful with Ceteareth-5?
Individuals who strictly avoid PEG compounds or synthetic emulsifiers Those with known sensitivity to ethoxylated ingredients
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.