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PEG-15 HYDROGENATED CASTOR OIL ISOSTEARATE.

Valuable / SURFACTANT - EMULSIFYING, VISCOSITY CONTROLLING

PEG-15 Hydrogenated Castor Oil Isostearate is a polyethylene glycol derivative of hydrogenated castor oil, functioning primarily as an emulsifier and viscosity modifier. It also acts as a solubilizer for various ingredients and can enhance the dermal penetration of other active compounds in formulations.

Summary

Emulsifying Viscosity Controlling Solubilizing Penetration Enhancer Humectant Consistency Enhancer Binding Agent Softening Agent Fixative

Science

Mechanism of Action

This ingredient facilitates the formation and stabilization of oil-in-water emulsions, ensuring product homogeneity. Its PEGylated structure allows it to solubilize lipophilic substances like fragrances and colorants into aqueous solutions. Furthermore, its amphiphilic nature can temporarily disrupt the skin barrier, enhancing the transdermal delivery of other co-formulated active ingredients.

Research

Clinical Evidence

Insufficient-data confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Both
Optimal pH N/A
0 7 14

Stability

While no specific optimal pH range is detailed for PEG-15 Hydrogenated Castor Oil Isostearate, related PEGylated castor oils, such as PEG-40 Hydrogenated Castor Oil, exhibit stability within a pH range of 5.5 to 7 (at 3% in water). This ingredient generally demonstrates compatibility with non-ionic, anionic, and cationic components. It can be efficiently incorporated into formulations during the heated oil phase or introduced during the cool-down phase.

Synergies

  • Compatible with non-ionic, anionic, and cationic ingredients.

Conflicts

  • Exercise caution when co-formulating with active ingredients whose safety profile is contingent on minimal dermal absorption, due to its capacity to enhance skin penetration.

Safety

Safety Profile

CIR Status
Safe with restrictions
Max tested
50%
Sensitization risk Unknown

The CIR Expert Panel deems PEGylated oils, including this ingredient, safe for cosmetic use when formulated to be non-irritating. Earlier safety assessments cited a safe use concentration up to 50% for PEG castor oils; while this limit is no longer explicitly specified for leave-on products used below 50%, it serves as a reference point for safe formulation. Formulators must be aware of its potential to increase the penetration of other substances. Trace amounts of 1,4-dioxane, a by-product of ethoxylation, may be present, but can be managed through purification processes. Castor oil and related PEG castor oil derivatives are approved by the FDA as flavoring agents or indirect food additives, respectively.

Your Skin

Skin Compatibility

No Normal
No Dry
No Oily
No Sensitive
Irritancy Unknown
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

PEG-15 Hydrogenated Castor Oil Isostearate is a valuable multi-functional ingredient, primarily acting as an emulsifier and solubilizer, with its safe use contingent on careful formulation to avoid irritation and manage enhanced penetration of co-ingredients.

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