Ingredient review
Ceteth-15
INCI: CETETH-15
Ceteth-15 is a gentle emulsifier that helps mix oil and water in cleansers and creams, with a low risk of irritation.
In plain English
Ceteth-15 is a mild ingredient made from cetyl alcohol (a fatty alcohol from coconut or palm oil) that has been modified with ethylene oxide to make it water-friendly. It acts as a bridge between oil and water, so products like lotions and cleansers stay smooth and don't separate. Because it's very gentle, it's often used in baby shampoos and sensitive-skin cleansers.
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
Ceteth-15 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 Ceteth-15.
- 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
Ceteth-15 is a polyethylene glycol (PEG) ether of cetyl alcohol, meaning it's a fatty alcohol that has been ethoxylated to become water-soluble. It belongs to the 'ceteth' family, where the number (15) indicates the average moles of ethylene oxide added. This makes it a non-ionic surfactant and emulsifier.
How it works
In a cosmetic product, Ceteth-15 reduces the surface tension between oil and water, allowing them to mix into a stable emulsion. It also helps lift dirt and oil from the skin or hair so they can be rinsed away. Because it's non-ionic, it works well with other ingredients and is less likely to cause irritation than harsher cleansers.
Pros
Very gentle on skin
Ceteth-15 is a non-ionic surfactant that is much milder than sulfates, making it suitable for sensitive skin and baby care products without causing dryness or irritation.
Effective emulsifier
It helps oil and water blend into a stable, creamy texture, so your lotions and cleansers stay well-mixed and feel smooth on the skin.
Cons and cautions
Potential 1,4-dioxane concern
As an ethoxylated ingredient, Ceteth-15 may contain trace amounts of 1,4-dioxane, a potential contaminant. However, reputable manufacturers purify it to safe levels, and regulatory bodies consider it safe at low concentrations.
Not for strict PEG-free routines
If you avoid all polyethylene glycol (PEG) compounds for personal or environmental reasons, Ceteth-15 would not fit your criteria.
Best for
- People with normal to dry skin looking for a gentle cleanser
- Those who prefer mild, non-stripping surfactants in their daily routine
Use caution if
- Individuals who specifically avoid PEGs or ethoxylated ingredients due to personal preference or ethical concerns
Usage tips
Safety summary
Ceteth-15 is considered safe for use in cosmetics at typical concentrations. The main safety discussion involves trace 1,4-dioxane, but levels are tightly controlled by manufacturers and regulators. It is non-irritating and non-sensitizing for most people.
Research notes
The Cosmetic Ingredient Review (CIR) panel has reviewed ceteth compounds and found them safe as used. Studies show low irritation potential and good compatibility with skin. No significant human or animal toxicity concerns have been reported at cosmetic use levels.
Common label clues
- Typical concentration
- 0.5–5% in rinse-off products; lower in leave-on formulas
- Regulatory status
- Approved for use in cosmetics by the FDA (as part of generally recognized safe ingredients) and by the EU Cosmetics Regulation. The Cosmetic Ingredient Review (CIR) panel has deemed ceteth compounds safe as used.
- Common uses
- Cleansers, Shampoos, Conditioners, Lotions, Creams
- Environmental note
- Derived from palm or coconut oil, so sourcing can impact deforestation. Look for RSPO-certified palm or sustainably sourced coconut derivatives if environmental impact is a concern.
Good to know
- The number '15' indicates the average ethylene oxide units, which affects water solubility and mildness.
- Ceteth-15 is often used alongside cetyl alcohol to improve texture and foam quality.
Common questions
What is Ceteth-15 in beauty products?
Ceteth-15 is a mild ingredient made from cetyl alcohol (a fatty alcohol from coconut or palm oil) that has been modified with ethylene oxide to make it water-friendly. It acts as a bridge between oil and water, so products like lotions and cleansers stay smooth and don't separate. Because it's very gentle, it's often used in baby shampoos and sensitive-skin cleansers.
What does Ceteth-15 do in a beauty product?
In a cosmetic product, Ceteth-15 reduces the surface tension between oil and water, allowing them to mix into a stable emulsion. It also helps lift dirt and oil from the skin or hair so they can be rinsed away. Because it's non-ionic, it works well with other ingredients and is less likely to cause irritation than harsher cleansers.
Is Ceteth-15 safe for most people?
Ceteth-15 is considered safe for use in cosmetics at typical concentrations. The main safety discussion involves trace 1,4-dioxane, but levels are tightly controlled by manufacturers and regulators. It is non-irritating and non-sensitizing for most people.
Who should be careful with Ceteth-15?
Individuals who specifically avoid PEGs or ethoxylated ingredients due to personal preference or ethical 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.