Ingredient review

Ceteareth-2

INCI: Ceteareth-2

Ceteareth-2 is a gentle emulsifier that helps create stable, creamy textures in skincare, but it may be derived from ethylene oxide, which concerns some consumers.

beautyskincareemulsifier

In plain English

Ceteareth-2 is a helper ingredient that allows oil and water to mix together in your lotions and creams. It's what gives many moisturizers their smooth, even texture. It's made from a combination of fatty alcohols (from natural oils) and ethylene oxide, a synthetic compound. In small amounts, it's considered safe and non-irritating for most skin types.

Review score

Safety, usefulness, and evidence

4.0Good

4.0/ 5

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

How reviews are scored

Quick decision guide

Useful, but context matters

Ceteareth-2 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-2.
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

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

Ceteareth-2 is a semi-synthetic emulsifier created by reacting cetearyl alcohol (a blend of cetyl and stearyl alcohols, often from coconut or palm oil) with 2 moles of ethylene oxide. It belongs to the ceteareth family of surfactants and is used to stabilize oil-in-water emulsions.

How it works

Ceteareth-2 works by reducing the surface tension between oil and water, allowing them to blend into a stable, uniform cream or lotion. Its molecule has a water-loving (hydrophilic) end and an oil-loving (lipophilic) end, so it positions itself at the interface of oil and water droplets, preventing them from separating.

Pros

Gentle emulsifier

Ceteareth-2 is considered low-irritation and is well-tolerated by most skin types, making it a common choice for daily moisturizers.

Improves product feel

It helps create a smooth, non-greasy texture that spreads easily, enhancing the user experience of creams and lotions.

Cons and cautions

Ethoxylation concerns

Ceteareth-2 is made with ethylene oxide, a process that can leave trace impurities like 1,4-dioxane, though levels are tightly regulated and generally very low.

Not natural

Despite being derived partly from natural fatty alcohols, the ethoxylation step makes it a semi-synthetic ingredient, which may not appeal to clean beauty enthusiasts.

Best for

People who use conventional moisturizers and creams
Those with normal to combination skin looking for stable, well-textured products

Use caution if

Individuals seeking 100% natural or organic skincare
Those with known sensitivity to ethoxylated ingredients

Usage tips

Use in oil-in-water emulsions at 0.5–5% for stable creams and lotions.

Combine with Ceteareth-20 for finer emulsion texture and better stability.

Store products containing Ceteareth-2 in a cool, dry place to maintain emulsion integrity.

Safety summary

Ceteareth-2 is considered safe for use in cosmetics at typical concentrations. The main safety consideration is the potential for trace contamination with 1,4-dioxane during manufacturing, but reputable brands ensure purification to meet safety standards. It has low irritation and comedogenic potential.

Research notes

The Cosmetic Ingredient Review (CIR) panel reviewed ceteareth compounds and concluded they are safe as used in cosmetics. Studies show low acute toxicity and skin irritation. No significant evidence links topical use of ceteareth-2 to long-term health risks.

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 as used in rinse-off and leave-on products.
Common uses: Moisturizers, Cleansers, Lotions, Creams
Environmental note: Ceteareth-2 is not readily biodegradable due to its ethoxylated structure, but it is used in low concentrations and is not considered a major environmental concern.

Good to know

Ceteareth-2 is often used alongside Ceteareth-20 to balance the hydrophilic-lipophilic balance (HLB) of an emulsion.
The number '2' refers to the moles of ethylene oxide added; higher numbers (e.g., Ceteareth-20) are more water-soluble.

Common questions

What is Ceteareth-2 in beauty products?

What does Ceteareth-2 do in a beauty product?

Is Ceteareth-2 safe for most people?

Who should be careful with Ceteareth-2?

Individuals seeking 100% natural or organic skincare Those with known sensitivity to ethoxylated ingredients

Research sources

Cosmetic Ingredient Review (CIR) - Safety Assessment of Ceteareth CompoundsOpen EU CosIng Database - Ceteareth-2Open PubMed - Safety of Ethoxylated SurfactantsOpen

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.