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Sodium Isostearoyl Lactylate (ISL)

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Sodium Isostearoyl Lactylate (ISL)

Multifunctional liquid lactylate for emulsification, conditioning, moisture support and refined skin and hair feel.

INCI Name: Sodium Isostearoyl Lactylate

CAS Number: 66988-04-3

Appearance: Clear to pale yellow viscous liquid

HLB: Approximately 5.9

Function: Emulsifier, co-emulsifier, conditioning agent, secondary surfactant, humectant and sensory modifier

Sodium Isostearoyl Lactylate is a multifunctional acyl lactylate used in skincare, haircare and cleansing formulations where both formulation performance and finished-product feel are important.

It can support the formation and stability of emulsions while contributing softness, conditioning and moisture-supporting properties. Its liquid format also makes it easy to incorporate into oil-phase and mixed emulsifier systems without the handling requirements of many waxy emulsifiers.

Multifunctional Emulsifier Co-Emulsifier Conditioning Agent Moisture Support Secondary Surfactant Skin Feel Enhancer Hair Conditioning Liquid Lactylate

Supplied as a cosmetic raw material for professional formulation use.

Performance & Formulation

Emulsification with Added Conditioning Benefits

ISL is useful when a formulation needs more than basic emulsion structure. In addition to supporting emulsification, it can contribute conditioning, softness and improved sensory characteristics to both skin and hair formulations.

This makes it particularly useful as part of sophisticated emulsifier systems where stability, texture and after-feel are all important.

Emulsion Support

Sodium Isostearoyl Lactylate can be used as an emulsifier or co-emulsifier in a range of cosmetic systems. It can help support oil-phase distribution, emulsion structure and overall formulation stability when used alongside compatible emulsifiers and structuring ingredients.

Its liquid format also allows easy incorporation into oil phases and emulsifier blends, making it useful in creams, lotions, conditioning products and specialty emulsions.

Conditioning & Sensory Performance

ISL contributes a soft, conditioned feel that can improve the sensory profile of both leave-on and rinse-off products. It can help reduce the dry or harsh after-feel sometimes associated with cleansing and surfactant systems while supporting a smoother finish on skin and hair.

In richer emulsions, it can also help create a more refined sensory profile by complementing heavier waxes, fatty alcohols and lipid-phase ingredients.

Moisture Support

Lactylates are valued for their ability to contribute moisture-supporting and conditioning properties within cosmetic formulations. ISL can help improve the overall moisturized feel of creams, lotions, cleansers and conditioning systems while supporting a softer after-feel.

Cleansing & Secondary Surfactant Function

ISL can also function as a secondary surfactant within cleansing systems. When incorporated alongside primary surfactants, it can contribute conditioning and sensory benefits while helping create a more balanced cleansing profile.

This makes it useful in facial cleansers, body washes, shampoos and other formulations where both cleansing performance and mild after-feel are important.

Key Benefits

  • Supports formation and stability of cosmetic emulsions.
  • Useful as both an emulsifier and co-emulsifier.
  • Provides conditioning benefits for skin and hair.
  • Supports a softer, smoother after-feel.
  • Contributes moisture-supporting functionality.
  • Can improve sensory quality in leave-on and rinse-off products.
  • Functions as a secondary surfactant in cleansing systems.
  • Liquid format allows convenient incorporation into oil-phase systems.
  • Can complement fatty alcohols, nonionic emulsifiers and other structuring ingredients.
  • Useful across skincare, haircare and cleansing formulations.

Suggested Use Levels

  • 1–3% — Co-emulsification, conditioning and sensory enhancement
  • 3–5% — Emulsion support, cleansing systems and stronger conditioning functionality
  • Up to 10% — Specialized formulations where higher functional loading is appropriate

The optimum level depends on the complete emulsifier system, oil phase, surfactant composition and desired sensory profile.

Ideal Applications

  • Face creams and moisturizers
  • Body lotions
  • Barrier-support creams and lotions
  • Lightweight emulsions
  • Rich emulsions and treatment creams
  • Facial cleansers
  • Cleansing creams
  • Body washes
  • Shampoos and scalp cleansers
  • Hair conditioners
  • Leave-in conditioning products
  • Baby and gentle-care formulations
  • Makeup bases and cosmetic emulsions
  • Specialty emulsifier systems

Formulation Notes

  • Generally incorporate into the oil phase or emulsifier phase.
  • Can be used as a primary supporting emulsifier or as part of a broader co-emulsifier system.
  • Pairs well with fatty alcohols, nonionic emulsifiers and other lipid-phase structuring ingredients.
  • Can also be incorporated into surfactant systems for cleansing and haircare applications.
  • May help improve the sensory profile of formulations containing heavier oils, waxes or fatty alcohols.
  • Final viscosity and emulsion structure depend on the complete emulsifier system and oil-phase composition.
  • Evaluate compatibility, processing temperature and long-term stability in the complete formulation.
  • Conduct appropriate stability testing before full-scale production.

Best Used as Part of the Complete Emulsifier System

ISL is a multifunctional formulation ingredient rather than a universal standalone emulsifier. Its performance depends on the complete oil phase, emulsifier system, processing method and finished-product requirements. Evaluate the full formulation to determine the optimum level and complementary structuring ingredients.

Documents

  • Certificate of Analysis (COA)
  • Safety Data Sheet (SDS)

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