Sodium Stearoyl Lactylate

Benefits
Softening

What is Sodium Stearoyl Lactylate?

Sodium stearoyl lactylate is the sodium salt of stearoyl lactylic acid, formed by esterifying stearic acid—typically sourced from vegetable oils—with lactic acid derived from fermentation processes like corn or milk sugars. This anionic compound serves as a multifunctional ingredient primarily in rinse-off cleansers, shampoos, lotions, and creams. It works by reducing surface tension between oil and water phases, forming stable micelles that enable effective cleansing and emulsification. In formulations, it creates a protective interfacial film around oil droplets, preventing separation and ensuring smooth, uniform textures. Its mild nature supports gentle foaming in washes and consistent spreadability in moisturizers, making it suitable for everyday personal care products across various skin types.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1 View on EWG →
PubChem View on PubChem →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Surfactant
Lowers surface tension to enable cleansing, emulsifying, and foaming; central to shampoos, body washes, and many emulsions and micellar systems.
Emulsifying agent
Enables stable mixing of oil and water phases by forming an interfacial film, helping create lotions, creams, and cleansers with consistent texture.

Benefits

Provides softening effect for smoother skin feel.

Stabilizes emulsions in lotions and creams for better texture.

Enables gentle cleansing without harshness in washes.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
People with dry skin seeking softening ingredients.
Anyone with known allergies to lactic acid derivatives.
Those preferring non-comedogenic formulas.
People sensitive to anionic surfactants.
Individuals using emulsified products like lotions daily.
Those preferring completely preservative-free products.

Safety Notes

  • Rated low hazard by EWG with scores of 1.
  • Deemed safe for cosmetic use by Cosmetic Ingredient Review.

Frequently Asked Questions about Sodium Stearoyl Lactylate

What is sodium stearoyl lactylate?

A sodium salt from stearic and lactic acids, used as a surfactant and emulsifier in cosmetics.

Is it safe for sensitive skin?

Yes, it has a low EWG rating and is considered safe with minimal irritation risk.

Does it cause acne?

No, it carries a comedogenic rating of 0.