Researched by Helena DeMaria-Williams
Formula IngredientEmulsifierSodium Stearoyl Lactylate
INCI: Sodium Stearoyl Lactylate
Sodium stearoyl lactylate (SSL) is an anionic emulsifier derived from lactic acid and stearic acid, neutralised with sodium hydroxide to form a sodium salt. It appears as a white to light tan powder and works by stabilising oil-in-water emulsion systems, preventing ingredient separation and improving the texture and homogeneity of formulations. It also acts as a mild humectant, forming a conditioning barrier on the skin that supports moisture retention.
Category
Emulsifier
Irritation Risk
Low
Skin Types
all skin types, dry, sensitive, oily, acne-prone, combination
What does this do in a formula?
emulsification, formulation stabilisation, skin conditioning, mild moisturisation, improved texture, foam enhancement in cleansers
Is Sodium Stearoyl Lactylate safe? Key considerations
Can Sodium Stearoyl Lactylate cause irritation?
Low RiskConsidered safe and non-irritating at typical cosmetic concentrations (3–20%). The Cosmetic Ingredient Review (CIR) Expert Panel concluded it is safe in current cosmetic practices. Rare allergic contact reactions have been reported in individuals with hypersensitivity; patch testing is advisable for very sensitive skin. No EU CosIng Annex II or III restrictions apply.
Does Sodium Stearoyl Lactylate increase sun sensitivity?
No RiskSodium stearoyl lactylate does not increase photosensitivity. No sun protection precautions are required based on its presence in a formulation.
Is Sodium Stearoyl Lactylate safe during pregnancy?
SafeThe CIR Expert Panel assessed sodium stearoyl lactylate as safe in current cosmetic practices of use and concentration. The European Food Safety Authority found no reproductive or carcinogenic effects. No published literature has identified developmental or reproductive toxicity concerns. Limited specific pregnancy data exists, but the ingredient's well-established safety profile and derivation from naturally occurring fatty and lactic acids supports a safe classification.
How does Sodium Stearoyl Lactylate work?
Sodium stearoyl lactylate (SSL) is an anionic emulsifier derived from lactic acid and stearic acid, neutralised with sodium hydroxide to form a sodium salt. It appears as a white to light tan powder and works by stabilising oil-in-water emulsion systems, preventing ingredient separation and improving the texture and homogeneity of formulations. It also acts as a mild humectant, forming a conditioning barrier on the skin that supports moisture retention.
Individuals with known allergy to stearic acid or lactic acid derivatives should review the considerations above before use.
Which products contain Sodium Stearoyl Lactylate?
Shop products that contain Sodium Stearoyl Lactylate
