Ingredient review
Ceteareth-16
INCI: Ceteareth-16
Ceteareth-16 is a reliable emulsifier that helps mix oil and water, but it may be slightly irritating for very sensitive skin.
In plain English
Ceteareth-16 is a synthetic ingredient that helps oil and water stay mixed together in your skincare products. Without it, your lotion or cream would separate into a watery layer and an oily layer. It's a type of emulsifier that also helps cleanse the skin by allowing dirt and oil to be rinsed away with water. While generally safe, it can be mildly irritating for some people, especially those with very sensitive or compromised skin.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Main practical flags: irritation is moderate; clogging risk is low.
- Source
- synthetic
- Evidence
- moderate
- Irritation
- moderate
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Ceteareth-16 can be useful, but watch for some irritation potential.
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-16.
- 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
moderateCan bother some users, especially with frequent use, damaged skin, or strong companion ingredients.
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-16 is a polyethylene glycol (PEG) ether of cetearyl alcohol, a mixture of fatty alcohols. It is produced synthetically and belongs to the ceteareth family of emulsifiers, which are numbered based on the length of the PEG chain (16 indicates the average number of ethylene oxide units).
How it works
In a cosmetic formula, Ceteareth-16 reduces the surface tension between oil and water, allowing them to form a stable emulsion. This creates a smooth, uniform texture in creams and lotions. As a surfactant, it also helps lift dirt and excess oil from the skin's surface, making it useful in cleansers.
Pros
Effective emulsifier
Ceteareth-16 reliably blends oil and water, giving your creams and lotions a smooth, consistent texture that doesn't separate.
Enhances cleansing
It helps water mix with oils on your skin, making cleansers more effective at removing makeup, sunscreen, and excess sebum.
Cons and cautions
Potential mild irritation
For people with very sensitive or compromised skin, Ceteareth-16 may cause slight stinging or redness, especially in leave-on products.
Synthetic origin concerns
It is made from ethylene oxide, a process that some consumers prefer to avoid, though the finished ingredient is considered safe in approved concentrations.
Best for
- People with normal to oily skin looking for effective cleansers
- Anyone using stable, well-formulated creams or lotions
Use caution if
- Individuals with very sensitive, reactive, or eczema-prone skin who may prefer gentler emulsifiers
Usage tips
Safety summary
Ceteareth-16 is considered safe for use in cosmetics at typical concentrations. The Cosmetic Ingredient Review (CIR) panel has evaluated similar ceteareth compounds and found them safe when formulated to be non-irritating. However, raw ethylene oxide is a known carcinogen, but the finished ingredient contains only trace amounts and is not considered a health risk.
Research notes
Studies on ceteareth compounds indicate low acute toxicity and minimal skin irritation at low concentrations. Most safety data comes from the CIR panel and industry assessments, with no strong evidence linking topical use to long-term health issues.
Common label clues
- Typical concentration
- Typically 1–5% in rinse-off products, lower in leave-on formulas
- Regulatory status
- Approved for use in cosmetics by the FDA and the European Commission, with concentration limits typically around 5% in leave-on products.
- Common uses
- Cleansers, Moisturizers, Lotions, Creams
- Environmental note
- Ceteareth-16 is synthetic and not readily biodegradable, which may be a concern for environmentally conscious consumers.
Good to know
- Ceteareth-16 is often used alongside other emulsifiers like cetearyl alcohol for better stability.
- The number '16' refers to the length of the polyethylene glycol chain, which affects how water-loving the ingredient is.
Common questions
What is Ceteareth-16 in beauty products?
Ceteareth-16 is a synthetic ingredient that helps oil and water stay mixed together in your skincare products. Without it, your lotion or cream would separate into a watery layer and an oily layer. It's a type of emulsifier that also helps cleanse the skin by allowing dirt and oil to be rinsed away with water. While generally safe, it can be mildly irritating for some people, especially those with very sensitive or compromised skin.
What does Ceteareth-16 do in a beauty product?
In a cosmetic formula, Ceteareth-16 reduces the surface tension between oil and water, allowing them to form a stable emulsion. This creates a smooth, uniform texture in creams and lotions. As a surfactant, it also helps lift dirt and excess oil from the skin's surface, making it useful in cleansers.
Is Ceteareth-16 safe for most people?
Ceteareth-16 is considered safe for use in cosmetics at typical concentrations. The Cosmetic Ingredient Review (CIR) panel has evaluated similar ceteareth compounds and found them safe when formulated to be non-irritating. However, raw ethylene oxide is a known carcinogen, but the finished ingredient contains only trace amounts and is not considered a health risk.
Who should be careful with Ceteareth-16?
Individuals with very sensitive, reactive, or eczema-prone skin who may prefer gentler emulsifiers
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.