INCI: Sodium Lauroyl Lactylate - Also known as: SLL, Sodium Lauroyllactylate, Lactic Acid Lauryl Ester Sodium Salt

QUICK FACTS

What is Sodium Lauroyl Lactylate?

Sodium Lauroyl Lactylate (SLL) is an anionic surfactant produced by reacting lactic acid with lauric acid - a C12 fatty acid found in coconut and palm kernel oil - and neutralizing the resulting ester acid with sodium hydroxide. The product is a sodium salt with an amphiphilic molecular structure: a hydrophilic lactic acid head group linked through an ester bond to a hydrophobic lauric acid tail. This architecture gives it the emulsifying character of a fatty acid surfactant alongside a noticeably milder skin interaction profile than many conventional anionic surfactants.

SLL belongs to a class of surfactants derived from naturally occurring food-grade acids, and it is widely recognized in cosmetic formulation for its skin-conditioning properties alongside its emulsification function. Unlike conventional sulfate-based emulsifiers, sodium lauroyl lactylate's lactic acid head group is biocompatible with the skin's own lactate-containing NMF environment - its ionic character at physiological pH is consistent with the skin's surface chemistry rather than disruptive to it.

At Sweet Chemistry, Sodium Lauroyl Lactylate appears below 1% in the Elasticity Reinforcing Hydra-Cream and Lipid-Cream alongside Sodium Stearoyl Glutamate, another mild plant-derived emulsifier, as part of the supporting emulsification system that helps maintain the stability and consistency of these richer cream formulas.

What does it do for skin?

Sodium Lauroyl Lactylate performs two complementary functions in the Sweet Chemistry cream formulas. As an emulsifier, it contributes to the stability of the oil-in-water emulsion system - working alongside the primary olivem-based emulsifiers (cetearyl olivate and sorbitan olivate) and the rheology modifiers (carbomer, xanthan gum, polyvinyl alcohol) to maintain the even distribution of actives throughout the formula from manufacturing to last use.

As a skin conditioner, SLL's lactic acid-derived head group is associated with a smooth, comfortable skin feel at the point of application - contributing to the cushioned satin finish of the Hydra-Cream and the emollient radiant finish of the Lipid-Cream. Its conditioning character is milder and more surface-compatible than many conventional surfactant conditioners, which can disrupt barrier lipids at higher concentrations. At the below-1% concentrations used in these formulas, SLL contributes conditioning skin feel without any meaningful surfactant stripping.

The lactic acid component of Sodium Lauroyl Lactylate is also associated with mild pH-buffering character - consistent with the broader lactate-based pH support provided by sodium lactate in the same formulas. While the contribution at this concentration is minor, it is consistent with the overall formulation philosophy of choosing ingredients that contribute to the skin's natural surface chemistry rather than working against it.

FOUND IN

In 2 Formulas

Sodium Lauroyl Lactylate is specific to Sweet Chemistry's two cream formulas, where it contributes to the emulsion stability and skin-conditioning system of each product alongside the primary olivem emulsifiers.

Hydration - Dry to Normal

Elasticity Reinforcing Hydra-Cream Sodium Lauroyl Lactylate - 1.7 oz / 50 ml

In the Hydra-Cream, SLL contributes to the emulsion stability and cushioned satin skin feel of a 40%-active formula carrying 3% Matrikynes® peptides, 2% THD ascorbate, and the full ceramide barrier complex.

Hydration - Dry to Dehydrated

Elasticity Reinforcing Lipid-Cream Sodium Lauroyl Lactylate - 1.7 oz / 50 ml

In the Lipid-Cream, SLL supports the stability and skin feel of a 46%-active emulsion alongside shea butter, the full botanical seed oil complex, and the ceramide barrier blend.

WORKS TOGETHER WITH

Natural Emulsifier Cetearyl Olivate + Sorbitan Olivate

INCI: Cetearyl Olivate, Sorbitan Olivate.

The primary olivem-based natural emulsifier system in both cream formulas. Synergy Note: Sodium Lauroyl Lactylate supports and complements the primary olivem emulsifier system rather than replacing it - together they create a more robust emulsion architecture that maintains active distribution consistency across the product's full shelf life and use cycle.

Co-Emulsifier Sodium Stearoyl Glutamate

INCI: Sodium Stearoyl Glutamate.

A plant-derived glutamic acid-based emulsifier present alongside SLL in both cream formulas. Synergy Note: Sodium Lauroyl Lactylate and Sodium Stearoyl Glutamate are both mild, plant-derived anionic emulsifiers with complementary fatty acid chain lengths (C12 vs. C18) - their paired presence creates a broader emulsification coverage within the cream system.

NMF Component Sodium Lactate

INCI: Sodium Lactate.

Present in both cream formulas as part of the NMF restoration system. Synergy Note: Sodium Lauroyl Lactylate's lactic acid-derived head group and Sodium Lactate are both lactic acid derivatives present in the same formulas - their co-occurrence reflects a formulation approach that uses lactic acid-related compounds consistently across multiple ingredient functions, from NMF humectancy to emulsification.

ECM Peptide Complex Matrikynes® Bone Peptides

INCI: Hydrolyzed Cow Bone Extract.

At 3% in all four formulas, associated with improvements in the appearance of skin density and aging signs. Synergy Note: SLL's contribution to emulsion stability helps ensure that Matrikynes® peptides remain evenly distributed throughout both cream formulas - consistent active delivery depends on consistent emulsion integrity.