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PHYTOSTERYL ISOSTEARYL DIMER DILINOLEATE.

Valuable / BINDING, HAIR CONDITIONING, SKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT, VISCOSITY CONTROLLING

Phytosteryl Isostearyl Dimer Dilinoleate is an advanced emollient that deeply conditions the skin, establishing a robust moisture barrier. It works to significantly reduce trans-epidermal water loss, promoting a smoother texture, enhanced radiance, and supporting overall skin health.

Summary

hair conditioning skin conditioning emollient viscosity controlling binding

Science

Mechanism of Action

This ingredient functions primarily as an emollient, imparting a softened and smoothed feel to the skin. It creates a protective layer that actively prevents moisture evaporation and enhances the skin's natural barrier function, leading to improved hydration and restored luminosity. Beyond its moisturizing capabilities, it helps to mitigate irritation, making it suitable for delicate skin, and also refines product textures while potentially boosting the efficacy of other active ingredients such as vitamins and antioxidants.

Research

Clinical Evidence

Medium confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 A 100% concentration of Phytosteryl Isostearyl Dimer Dilinoleate was shown to be practically non-irritating in cumulative skin irritation studies on guinea pigs.
  2. 02 A related oligomer ester, Bis-behenyl/isostearyl/phytosteryl dimer dilinoleyl dimer dilinoleate, demonstrated excellent moisturizing effects in human use tests, exhibiting a 200% water holding capability.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

This highly lipophilic ingredient is oil-soluble and demonstrates strong stability against oxidation. It also functions as an emulsion stabilizer, contributing to desirable spreadability, skin feel, and adherence in formulations.

Synergies

  • Vitamins
  • Antioxidants

Safety

Safety Profile

CIR Status
Insufficient data
Max tested
58.7%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel is currently conducting an 'Amended Safety Assessment' for Dimer Dilinoleates, including this ingredient, as of 2025. While a maximum use concentration of 58.7% has been reported in lip products, in vivo data at this specific level were not available for the draft CIR report. In animal studies, 100% concentration was identified as a mild irritant in primary tests but proved practically non-irritating in cumulative skin irritation studies. Generally regarded as safe, it presents a low allergenic potential. European Cosmetics Regulation permits its use, advising adherence to specified concentration limits. A related ingredient has a 'low' EWG rating for cancer, allergies, and immunotoxicity.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

Phytosteryl Isostearyl Dimer Dilinoleate is a valuable emollient and barrier-strengthening ingredient, highly beneficial for improving skin hydration, texture, and radiance across all skin types, with a favorable safety profile.

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