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SODIUM LAUROYL METHYL ISETHIONATE.

Valuable CAS - / CLEANSING, SURFACTANT - CLEANSING

Sodium Lauroyl Methyl Isethionate (SLMI) is a mild, coconut-derived anionic surfactant. It is precisely formulated to deliver effective cleansing and luxurious foam, leaving the skin feeling conditioned and soft without compromising its natural barrier.

Summary

Cleansing Surfactant Foaming

Science

Mechanism of Action

Operating as an anionic surfactant, SLMI efficiently reduces the skin's surface tension, facilitating uniform product distribution and the thorough removal of environmental impurities, dirt, and excess oils. Its mechanism yields a dense, creamy lather and ensures excellent rinsability, promoting a refreshed skin sensation.

Research

Clinical Evidence

High confidence
Effective range 0.009–40%
Optimal

N/A

Key findings

  1. 01 Concentrations observed in rinse-off cosmetic products typically range from 0.64% to 10.1%.
  2. 02 Recommended usage rates for liquid formulations extend up to 20%.
  3. 03 For solid formulations, recommended usage rates can be as high as 40%.
  4. 04 In leave-on cosmetic products, concentrations as low as 0.009% have been noted.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH 4.5 – 8.5
0 7 14

Stability

SLMI demonstrates hydrolytic stability within a pH range of 4.5 to 8.5. Its inherent water solubility supports the creation of clear liquid formulations. When formulating solid products, it may yield bars that are notably softer and require extended hardening times compared to those made with Sodium Cocoyl Isethionate (SCI).

Synergies

  • Amphoteric surfactants (e.g., cocamidopropyl betaine) for thickening.
  • Gums for thickening.
  • Salts for thickening.

Conflicts

  • Certain chelators, such as sodium phytate, may lead to cloudiness in formulations.

Safety

Safety Profile

CIR Status
Safe as used
Max tested
10.1%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has affirmed the safety of isethionate salts, including Sodium Lauroyl Methyl Isethionate, when applied in cosmetic products at concentrations and uses that ensure non-irritation. It boasts an Environmental Working Group (EWG) score of 1, indicating very low concern for toxicity and irritation. The liquid variant is approved by Whole Foods for its premium body care ingredient standards. However, due to its production method involving ethoxylation, it does not conform to COSMOS specifications for environmental friendliness.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Valuable

Sodium Lauroyl Methyl Isethionate is a valuable and gentle surfactant, offering effective cleansing and a luxurious foam across diverse skin types and product formats, ensuring a non-stripping feel.

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