Ingredient review
Ceteth-150
INCI: CETETH-150
Ceteth-150 is a gentle synthetic thickener and emulsifier that helps create smooth, stable textures in cleansers and lotions, but it offers no direct skin benefit beyond formulation.
In plain English
Ceteth-150 is a man-made ingredient derived from cetyl alcohol (a fatty alcohol from plants or petroleum) and ethylene oxide. In skincare and haircare, it acts like a helper that thickens watery formulas and helps oil and water mix together so the product stays smooth and doesn't separate. It is not an active ingredient for your skin—it's there to improve the feel and stability of the product. Think of it as the ingredient that makes your lotion creamy and your shampoo nicely viscous.
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
Ceteth-150 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-150.
- 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-150 is a polyethylene glycol (PEG) derivative of cetyl alcohol, with an average of 150 ethylene oxide units. It belongs to the 'ceteth' family of nonionic surfactants and emulsifiers. It is a waxy solid at room temperature and dissolves in water to form clear or slightly hazy solutions.
How it works
In a cosmetic formula, Ceteth-150 works by positioning itself at the interface between oil and water droplets. Its long PEG chain (the '150' part) is water-loving, while the cetyl chain is oil-loving. This dual nature allows it to stabilize emulsions (like lotions and creams) and increase the viscosity (thickness) of water-based products. It also helps disperse other ingredients evenly.
Pros
Gentle on skin
Ceteth-150 has a very low irritation and comedogenic risk, making it suitable for sensitive skin types and daily use in cleansers and moisturizers.
Improves product feel
It thickens watery formulas and stabilizes emulsions, giving lotions and shampoos a smooth, creamy texture that many users find pleasant.
Cons and cautions
Synthetic and PEG-based
Ceteth-150 is a synthetic PEG derivative, which may be a concern for those preferring natural or minimally processed ingredients. Some PEGs can contain trace impurities like 1,4-dioxane, though reputable manufacturers purify them.
No active skin benefit
Unlike humectants or antioxidants, Ceteth-150 does not hydrate, repair, or protect the skin. Its only role is to improve formula texture and stability.
Best for
- Anyone using water-based cleansers, shampoos, or lotions
- People with sensitive skin who need gentle, non-irritating formulas
Use caution if
- Those seeking only natural or plant-derived ingredients
- Individuals with known allergies to PEG compounds (rare)
Usage tips
Safety summary
Ceteth-150 is considered safe for cosmetic use at typical concentrations. It has low irritation and comedogenic potential. The main safety consideration is the potential for trace impurities (1,4-dioxane) from manufacturing, but reputable suppliers purify the ingredient to meet safety standards. Overall, it is a well-tolerated formulation aid.
Research notes
Research on Ceteth-150 is limited, but it belongs to the well-studied class of PEG alkyl ethers. Safety assessments by the Cosmetic Ingredient Review (CIR) panel have found PEG derivatives safe for use in cosmetics when properly formulated. No significant toxicity or sensitization has been reported at typical use levels.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Ceteth-150 is approved for use in cosmetics in the US (FDA), EU (CosIng), and many other regions. It is subject to purity standards to limit impurities like 1,4-dioxane. Always check local regulations for specific restrictions.
- Common uses
- Cleansers, Shampoos, Conditioners, Lotions
- Environmental note
- As a synthetic PEG compound, Ceteth-150 may not be readily biodegradable in all environments. However, it is used in low concentrations and is not considered a major environmental concern compared to some other surfactants.
Good to know
- The number '150' refers to the average number of ethylene oxide units in the molecule, which affects its water solubility and thickening ability.
- Ceteth-150 is considered safe for use in rinse-off and leave-on products by major regulatory bodies when used at typical concentrations.
Common questions
What is Ceteth-150 in beauty products?
Ceteth-150 is a man-made ingredient derived from cetyl alcohol (a fatty alcohol from plants or petroleum) and ethylene oxide. In skincare and haircare, it acts like a helper that thickens watery formulas and helps oil and water mix together so the product stays smooth and doesn't separate. It is not an active ingredient for your skin—it's there to improve the feel and stability of the product. Think of it as the ingredient that makes your lotion creamy and your shampoo nicely viscous.
What does Ceteth-150 do in a beauty product?
In a cosmetic formula, Ceteth-150 works by positioning itself at the interface between oil and water droplets. Its long PEG chain (the '150' part) is water-loving, while the cetyl chain is oil-loving. This dual nature allows it to stabilize emulsions (like lotions and creams) and increase the viscosity (thickness) of water-based products. It also helps disperse other ingredients evenly.
Is Ceteth-150 safe for most people?
Ceteth-150 is considered safe for cosmetic use at typical concentrations. It has low irritation and comedogenic potential. The main safety consideration is the potential for trace impurities (1,4-dioxane) from manufacturing, but reputable suppliers purify the ingredient to meet safety standards. Overall, it is a well-tolerated formulation aid.
Who should be careful with Ceteth-150?
Those seeking only natural or plant-derived ingredients Individuals with known allergies to PEG compounds (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.