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SODIUM METHYL STEAROYL TAURATE.

Valuable CAS 149-39-3 / CLEANSING, FOAMING, SURFACTANT - CLEANSING

Sodium Methyl Stearoyl Taurate is a gentle anionic surfactant and cleansing agent, adept at effectively removing impurities while actively preserving the skin's natural barrier function. It helps maintain optimal skin pH and contributes to a soft, comfortable after-feel, making it a key component in mild and effective skincare formulations.

Summary

cleansing foaming surfactant emulsifying

Science

Mechanism of Action

This ingredient functions primarily as a surfactant, cleansing agent, and foaming agent. Its molecular structure, featuring a hydrophilic N-methyltaurine head and a lipophilic stearic acid chain connected by an amide bond, allows it to reduce surface tension. This property facilitates the emulsification of oil and water, effectively lifting dirt and oils from the skin. It is considered a mild cleanser that actively supports skin barrier integrity and provides a smooth finish without compromising the skin's natural pH. Additionally, it can act as an emulsifier and helps optimize foam density, regulate viscosity, and ensure product homogeneity in formulations.

Research

Clinical Evidence

Low confidence
Effective range 0.1–5%
Optimal

N/A

Key findings

  1. 01 Studies on related taurate surfactants, such as sodium methyl oleyl taurate and sodium methyl cocoyl taurate, have shown benefits in reducing skin irritation and inflammation, alongside improvements in cellular repair function. While these findings are for a broader class of taurate surfactants and were observed in contexts such as bar soap formulations, they suggest a potential for similar gentle action from Sodium Methyl Stearoyl Taurate.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH 6 – 8
0 7 14

Stability

Stability in formulations is inferred to be optimal within a pH range of 6.0 to 8.0, based on observations of related taurate surfactants like Sodium Methyl Cocoyl Taurate, which exhibit stable foam production across a wide pH spectrum.

Safety

Safety Profile

CIR Status
Safe as used with restrictions
Max tested
6%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel concluded that Sodium Methyl Stearoyl Taurate is safe for use in cosmetics under current practices and concentrations, provided formulations are designed to be non-irritating. Typical maximum use concentrations are up to 6% in most general product categories and up to 1% in spray applications.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Unknown
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

Sodium Methyl Stearoyl Taurate is a valuable, gentle surfactant ideal for a wide range of skincare products, offering effective cleansing and emulsifying properties while supporting skin barrier health.

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