Ingredient review
Sodium Laureth-12 Sulfate
INCI: Sodium Laureth-12 Sulfate
A strong but slightly gentler cousin of SLS that effectively cleanses and foams, though it can still be drying for sensitive skin.
In plain English
Sodium Laureth-12 Sulfate is a synthetic detergent that helps water mix with oil and dirt so they can be rinsed away. It creates a rich lather in shampoos and body washes. The 'Laureth-12' part means it has been processed with ethylene oxide to make it less harsh than Sodium Lauryl Sulfate (SLS), but it can still strip natural oils if used too often.
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 Laureth-12 Sulfate 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 Laureth-12 Sulfate.
- 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 sodium salt of a sulfated ethoxylated lauryl alcohol, produced by reacting lauryl alcohol with 12 moles of ethylene oxide, then sulfating and neutralizing. It is a white or pale yellow paste or liquid.
How it works
It lowers the surface tension between water and oil, allowing dirt and sebum to be emulsified and washed away. Its long ethoxylate chain (12 units) makes it larger and less penetrating than SLS, reducing irritation potential while maintaining strong foaming.
Pros
Strong but gentler than SLS
The 12-unit ethoxylate chain makes it less irritating than Sodium Lauryl Sulfate, so it's a common choice for milder sulfate-based cleansers.
Excellent foaming
Produces a dense, creamy lather that many users associate with a satisfying clean, especially in shampoos and body washes.
Cons and cautions
Potential for dryness
Even though milder than SLS, it can still strip the skin's natural moisture barrier if used too frequently or in high concentrations.
Ethoxylation byproducts
The manufacturing process can generate trace amounts of 1,4-dioxane, a possible carcinogen, though reputable brands purify to safe levels.
Best for
- People with normal to oily skin or hair who enjoy a rich lather
- Those who tolerate sulfate cleansers without irritation
Use caution if
- Individuals with very dry, sensitive, or eczema-prone skin
- Anyone seeking a completely sulfate-free or low-foam routine
Usage tips
Safety summary
Generally safe for most people in rinse-off products at typical concentrations. The main concerns are potential skin dryness and trace 1,4-dioxane contamination, which is regulated and minimized by quality manufacturers.
Research notes
Studies show Sodium Laureth Sulfate (with varying ethoxylation) is less irritating than SLS but can still cause barrier disruption with prolonged exposure. The Cosmetic Ingredient Review (CIR) panel has deemed it safe as used in cosmetics.
Common label clues
- Typical concentration
- 1% to 15% in rinse-off products
- Regulatory status
- Approved for use in cosmetics by the FDA and EU CosIng database, with concentration limits in leave-on products typically below 1%.
- Common uses
- Shampoos, Body washes, Facial cleansers, Bubble baths
- Environmental note
- Synthetic surfactants like this can be slow to biodegrade and may be toxic to aquatic life in high concentrations; look for brands that treat wastewater responsibly.
Good to know
- Sodium Laureth-12 Sulfate is often listed simply as 'Sodium Laureth Sulfate' on labels; the number indicates the ethoxylation level.
- It is not the same as SLS (Sodium Lauryl Sulfate) — the 'eth' in Laureth means it's been made milder.
Common questions
What is Sodium Laureth-12 Sulfate in beauty products?
Sodium Laureth-12 Sulfate is a synthetic detergent that helps water mix with oil and dirt so they can be rinsed away. It creates a rich lather in shampoos and body washes. The 'Laureth-12' part means it has been processed with ethylene oxide to make it less harsh than Sodium Lauryl Sulfate (SLS), but it can still strip natural oils if used too often.
What does Sodium Laureth-12 Sulfate do in a beauty product?
It lowers the surface tension between water and oil, allowing dirt and sebum to be emulsified and washed away. Its long ethoxylate chain (12 units) makes it larger and less penetrating than SLS, reducing irritation potential while maintaining strong foaming.
Is Sodium Laureth-12 Sulfate safe for most people?
Generally safe for most people in rinse-off products at typical concentrations. The main concerns are potential skin dryness and trace 1,4-dioxane contamination, which is regulated and minimized by quality manufacturers.
Who should be careful with Sodium Laureth-12 Sulfate?
Individuals with very dry, sensitive, or eczema-prone skin Anyone seeking a completely sulfate-free or low-foam routine
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.