Ingredient review
Sodium Lauroyl Isethionate
INCI: Sodium Lauroyl Isethionate
A mild, coconut-derived cleanser that removes impurities without stripping the skin barrier, making it ideal for sensitive and dry skin types.
In plain English
Sodium Lauroyl Isethionate is a gentle cleansing ingredient made from coconut oil. Unlike harsh soaps that can leave your skin feeling tight and dry, this surfactant lifts away dirt, oil, and makeup while respecting your skin's natural moisture barrier. It produces a rich, creamy lather and rinses cleanly without residue. You'll often find it in sulfate-free cleansers and gentle bar soaps designed for sensitive skin.
Review score
Safety, usefulness, and evidence
Strong fit for many routines
The evidence base is relatively strong for its common cosmetic role.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- semi synthetic
- Evidence
- strong
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Easy yes for most routines
Sodium Lauroyl Isethionate 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 Sodium Lauroyl Isethionate.
- 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
strongThere is a stronger practical or research basis for the ingredient role described here.
What it is
A mild anionic surfactant produced by reacting lauric acid (from coconut oil) with isethionic acid, then neutralizing with sodium. It is a key ingredient in many gentle, soap-free cleansers.
How it works
It reduces the surface tension between water and oil, allowing impurities to be emulsified and rinsed away. Its large molecular structure makes it less penetrating than sulfates, so it cleans effectively without disrupting the skin's lipid barrier or causing irritation.
Pros
Extremely gentle on skin
Its large molecular structure means it cleans without penetrating or irritating the skin barrier, making it a top choice for sensitive and reactive skin types.
Sulfate-free and mild
Unlike sodium lauryl sulfate (SLS), SLI does not strip the skin of its natural moisture, helping maintain a healthy moisture balance after washing.
Cons and cautions
Less effective on heavy makeup
Because it is so gentle, it may struggle to remove long-wear or waterproof makeup without a double-cleansing step.
Can feel too mild for some
People accustomed to the tight, clean feeling from sulfates might feel this cleanser doesn't clean thoroughly enough, though that feeling is actually a sign of over-stripping.
Best for
- People with dry, sensitive, or eczema-prone skin
- Anyone seeking a sulfate-free, gentle daily cleanser
Use caution if
- Those who prefer a high-foaming, squeaky-clean feel may find it too mild
Usage tips
Safety summary
Sodium Lauroyl Isethionate is widely regarded as safe and non-irritating. It has a low potential for skin sensitization and is not known to be comedogenic. It is a preferred alternative to sulfates for sensitive skin.
Research notes
Multiple studies and dermatological reviews confirm its mildness and low irritation potential. It is listed in the CosIng database and has been evaluated by the Cosmetic Ingredient Review (CIR) panel as safe for use in cosmetics.
Common label clues
- Typical concentration
- 5–20% in rinse-off products
- Regulatory status
- Approved for use in cosmetics by the FDA and the European Commission. No concentration restrictions in rinse-off products.
- Common uses
- Facial cleansers, Body washes, Shampoos, Bar soaps
- Environmental note
- Derived from coconut oil and is readily biodegradable, making it a more sustainable choice compared to many petroleum-based surfactants.
Good to know
- Sodium Lauroyl Isethionate is often used in combination with other mild surfactants to improve foam and cleansing power.
- It is considered biodegradable and is commonly used in eco-friendly formulations.
Common questions
What is Sodium Lauroyl Isethionate in beauty products?
Sodium Lauroyl Isethionate is a gentle cleansing ingredient made from coconut oil. Unlike harsh soaps that can leave your skin feeling tight and dry, this surfactant lifts away dirt, oil, and makeup while respecting your skin's natural moisture barrier. It produces a rich, creamy lather and rinses cleanly without residue. You'll often find it in sulfate-free cleansers and gentle bar soaps designed for sensitive skin.
What does Sodium Lauroyl Isethionate do in a beauty product?
It reduces the surface tension between water and oil, allowing impurities to be emulsified and rinsed away. Its large molecular structure makes it less penetrating than sulfates, so it cleans effectively without disrupting the skin's lipid barrier or causing irritation.
Is Sodium Lauroyl Isethionate safe for most people?
Sodium Lauroyl Isethionate is widely regarded as safe and non-irritating. It has a low potential for skin sensitization and is not known to be comedogenic. It is a preferred alternative to sulfates for sensitive skin.
Who should be careful with Sodium Lauroyl Isethionate?
Those who prefer a high-foaming, squeaky-clean feel may find it too mild
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.