Science
Mechanism of Action
This ingredient functions by adsorbing onto the surface of skin and hair, forming a protective film. This film provides measurable moisturizing, lubricating, and conditioning effects. Containing a lactate structure, a natural component of the skin's Natural Moisturizing Factor (NMF), it actively helps to slow moisture loss and attract atmospheric moisture. Furthermore, it supports skin nutrition, aids in waste excretion, and may contribute to preventing the visible signs of skin aging, promoting a delicate and supple feel. When combined with UV absorbers, it can also assist in repairing and preventing sun-induced damage.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Sodium Isostearoyl Lactylate is slightly hygroscopic, dispersing effectively in warm water and dissolving in hot oil or fat. This dual solubility makes it an efficient emulsifier for creating fat-in-water emulsions. It is typically added to the oil phase of a formulation, with common usage levels ranging from 1% to 10%.
Synergies
- UV absorbers (for enhanced sun damage repair and prevention)
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded that Sodium Isostearoyl Lactylate, along with other alkanoyl lactyl lactate salts, is safe for use in cosmetics under current practices of use and concentration, provided formulations are non-irritating and non-sensitizing. While a rabbit skin irritation test indicated a primary irritation index of 7.17 for the undiluted ingredient and 1.13 at 15% concentration, suggesting potential for irritation at high levels, it is generally considered safe and non-irritating when properly formulated according to established guidelines. No specific SCCS review for cosmetic use was found, and EWG classifies concerns as 'Low' for various toxicities, though it restricts the ingredient for EWG VERIFIED products without adequate substantiation.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Sodium Isostearoyl Lactylate is a valuable multifunctional ingredient, providing significant moisturizing and conditioning benefits while serving as an effective emulsifier for a wide range of cosmetic formulations.
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