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Moumoujus

ISOPROPYL ISOSTEARATE.

Avoid CAS 31478-84-9 / 68171-33-5 / BINDING, SKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT

Isopropyl Isostearate is a branched-chain ester prized for its emollient and skin-conditioning properties. It forms a protective barrier on the skin, effectively minimizing transepidermal water loss and imparting a smooth, supple texture, while also enhancing formulation spreadability.

Summary

emollient skin conditioning binding

Science

Mechanism of Action

This ingredient functions as an emollient by creating a thin, protective film on the skin's surface. This barrier effectively reduces moisture evaporation, contributing to sustained hydration and a soft, pliable skin feel. It also acts as a lubricant, promoting a silky skin appearance and improving the uniform distribution and absorption of skincare formulations.

Research

Clinical Evidence

High confidence
Effective range 0.1–50%
Optimal

1%

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

This ingredient exhibits a neutral pH and demonstrates good oxidative stability under recommended storage conditions. It is highly miscible and compatible with various ester oils, silicone-based emulsifiers, and color pigments, enhancing formulation flexibility.

Synergies

  • ester oils
  • silicone-based emulsifiers
  • color pigments

Conflicts

  • strong oxidizing agents

Safety

Safety Profile

CIR Status
Safe as used
Max tested
50%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has thoroughly assessed Isopropyl Isostearate, affirming its safety for cosmetic use in concentrations up to 50.0%. While generally well-tolerated with a favorable safety profile, individuals with highly sensitive skin may rarely experience mild sensitivity. The SCCS has not directly reviewed this specific compound, and the FDA does not pre-approve cosmetic ingredients.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
No Oily
No Sensitive
Irritancy Low
Comedogenicity High

Our Assessment

Verdict

Avoid

While a proficient emollient for dry and normal skin with low irritancy, its high comedogenicity rating necessitates avoidance for facial applications, particularly for those prone to breakouts.

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