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ISOSTEARYL ISOSTEAROYL STEARATE.

Valuable CAS - / SKIN CONDITIONING

Isostearyl Isostearoyl Stearate is a high-performance emollient and skin-conditioning agent that significantly bolsters the skin's natural protective barrier. It effectively reduces transepidermal water loss, promoting deep hydration and imparting a soft, smooth skin texture. This ingredient optimizes the skin's intrinsic moisture retention capabilities.

Summary

Emollient Skin-conditioning agent Binding agent Viscosity controlling

Science

Mechanism of Action

This ingredient functions as an emollient by stabilizing the skin's crucial lipid layers and enhancing the efficacy of its Natural Moisturising Factors (NMF). It dramatically reduces transepidermal water loss (TEWL), thereby sustaining optimal hydration levels and reinforcing the skin's protective barrier. By forming a conditioning film on the surface, it prevents excessive water evaporation, leading to conditioned, soft, and smooth skin.

Research

Clinical Evidence

High confidence
Effective range 2–10%
Optimal

5%

Key findings

  1. 01 In specific body care formulations, Isostearyl Isostearate at this level has shown to surpass petrolatum in reducing water loss, thereby significantly supporting barrier function.
  2. 02 This range represents typical usage levels in skincare for its proven ability to prevent moisture loss, soften the skin, aid in improving an impaired barrier, and enhance overall product texture.
  3. 03 Usage guidelines suggest this concentration is optimal for achieving maximum benefits in cosmetic preparations.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

The ingredient itself maintains a neutral pH. Its high lipophilicity and saturated nature contribute to enhanced product stability by making it less susceptible to oxidation.

Safety

Safety Profile

CIR Status
Safe as used
Max tested
10%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel concluded that alkyl esters, including Isooctadecyl isooctadecanoate (a recognized synonym), are safe within current practices of use and concentration, provided they are formulated to be non-irritating. It poses a low risk of irritation or sensitization. This ingredient has not been directly reviewed by SCCS, and no specific FDA status is cited, though related fatty acids are commonly GRAS.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

Isostearyl Isostearoyl Stearate is a valuable emollient, clinically shown to significantly enhance skin hydration and barrier function, making it particularly beneficial for dry and sensitive skin.

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