Sorbitan Isostearate

Benefits
Softening

What is Sorbitan Isostearate?

Sorbitan Isostearate forms through esterification of sorbitol, a sugar alcohol from fruits, with isostearic acid, a branched fatty acid from vegetable oils like rapeseed. This non-ionic compound acts as a surfactant and emulsifier in cosmetics, primarily in oil-in-water formulations such as moisturizers, foundations, and sunscreens. It works by lowering interfacial tension between oil and water, creating stable emulsions that prevent phase separation and ensure smooth, spreadable textures. In cleansing products, it aids gentle dirt removal without stripping moisture. Its lipophilic nature allows incorporation into anhydrous systems like lip balms. Commonly used at low levels, it contributes to product stability and sensory feel, making formulations more elegant and user-friendly across daily skincare routines.

Comedogenic Rating 2/5 Moderate risk
EWG Safety Rating 1 View on EWG →

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 texture.

Stabilizes emulsions in creams and lotions for even application.

Supports mild cleansing in washes without harshness.

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 emollient textures.
Acne-prone skin due to moderate comedogenic potential.
Individuals using emulsion-based moisturizers daily.
People sensitive to fatty acid esters.
Those preferring gentle, non-stripping surfactants.
Individuals with known allergies to sorbitol derivatives.

Safety Notes

  • Rated low hazard by safety assessments.
  • Generally non-irritating in cosmetic use.

Frequently Asked Questions about Sorbitan Isostearate

What is Sorbitan Isostearate?

An ester of sorbitol and isostearic acid used as a gentle surfactant and emulsifier in cosmetics.

Is it safe for sensitive skin?

Typically low irritation potential based on safety reviews.

Does it clog pores?

Rated moderately comedogenic, so patch test if acne-prone.