Ingredient review
Sodium Octoxynol-2 Ethane Sulfonate
INCI: SODIUM OCTOXYNOL-2 ETHANE SULFONATE
An effective synthetic cleanser that helps remove oil and makeup, but may be drying or irritating for sensitive skin.
In plain English
Sodium Octoxynol-2 Ethane Sulfonate is a lab-made ingredient that acts like a bridge between water and oil. In a cleanser, it helps break down sebum, sunscreen, and makeup so they can be washed away with water. It belongs to a class of surfactants known for strong cleansing power, but it can also strip the skin of its natural oils if used too often or in high concentrations.
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
Sodium Octoxynol-2 Ethane Sulfonate 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 Sodium Octoxynol-2 Ethane Sulfonate.
- 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
A synthetic anionic surfactant derived from octoxynol (a type of alkylphenol ethoxylate) and sulfonate chemistry. It is designed to lower the surface tension between water and oil, making it an effective cleansing agent.
How it works
Its molecule has a water-loving (hydrophilic) head and an oil-loving (lipophilic) tail. When you lather a product containing it, the tails grab onto oils and dirt while the heads stay in the water. Rinsing then washes away the suspended grime.
Pros
Strong cleansing power
Effectively dissolves oil, sebum, and stubborn makeup, leaving skin feeling thoroughly clean.
Good lather
Creates a rich foam that many users find satisfying and easy to spread across the face or body.
Cons and cautions
Potential for dryness
Its strong cleansing action can strip natural oils, leading to tightness, flakiness, or irritation, especially in dry or sensitive skin.
Not ideal for daily use on sensitive skin
Repeated use may disrupt the skin barrier, causing redness or increased sensitivity over time.
Best for
- People with oily or combination skin who need a deep cleanse
- Those who wear heavy makeup or water-resistant sunscreen daily
Use caution if
- Individuals with dry, sensitive, or compromised skin barriers
Usage tips
Safety summary
Generally recognized as safe for rinse-off cosmetic use at typical concentrations. However, it can cause irritation or dryness in sensitive individuals. Avoid contact with eyes and broken skin.
Research notes
Limited peer-reviewed studies specifically on this ingredient. Its safety is inferred from broader surfactant research and regulatory reviews. The Cosmetic Ingredient Review (CIR) has evaluated similar sulfonate surfactants and found them safe in rinse-off products when formulated correctly.
Common label clues
- Typical concentration
- Usually 1–10% in rinse-off products
- Regulatory status
- Approved for use in cosmetics in the US, EU, and many other regions. In the EU, it is subject to concentration limits in leave-on products, but is generally considered safe in rinse-off formulations at typical levels.
- Common uses
- Facial cleansers, Body washes, Shampoos, Makeup removers
- Environmental note
- As a synthetic surfactant, it may not be readily biodegradable. Some concerns exist about alkylphenol ethoxylates in the environment, though this specific variant is sulfonated and may behave differently.
Good to know
- This ingredient is often found in gel or foaming cleansers rather than cream or oil-based ones.
- It is not the same as sodium laureth sulfate, but shares similar cleansing properties.
Common questions
What is Sodium Octoxynol-2 Ethane Sulfonate in beauty products?
Sodium Octoxynol-2 Ethane Sulfonate is a lab-made ingredient that acts like a bridge between water and oil. In a cleanser, it helps break down sebum, sunscreen, and makeup so they can be washed away with water. It belongs to a class of surfactants known for strong cleansing power, but it can also strip the skin of its natural oils if used too often or in high concentrations.
What does Sodium Octoxynol-2 Ethane Sulfonate do in a beauty product?
Its molecule has a water-loving (hydrophilic) head and an oil-loving (lipophilic) tail. When you lather a product containing it, the tails grab onto oils and dirt while the heads stay in the water. Rinsing then washes away the suspended grime.
Is Sodium Octoxynol-2 Ethane Sulfonate safe for most people?
Generally recognized as safe for rinse-off cosmetic use at typical concentrations. However, it can cause irritation or dryness in sensitive individuals. Avoid contact with eyes and broken skin.
Who should be careful with Sodium Octoxynol-2 Ethane Sulfonate?
Individuals with dry, sensitive, or compromised skin barriers
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.