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PEG-65 BUTYLENE GLYCOL ISOSTEARATE.

Questionable / SURFACTANT - CLEANSING, SURFACTANT - EMULSIFYING

PEG-65 Butylene Glycol Isostearate is a multifunctional ingredient serving primarily as a cleansing agent and emulsifier, ensuring stable oil-in-water formulations. Its complex structure also imparts humectant, emollient, and solvent properties, enhancing product texture and skin hydration.

Summary

cleansing agent emulsifier surfactant humectant emollient solvent penetration enhancer

Science

Mechanism of Action

This ingredient operates by facilitating the stable blending of immiscible oil and water phases, acting as an effective emulsifier. As a surfactant, it functions as a cleansing agent, helping to lift and remove impurities from the skin. The polyethylene glycol (PEG) derivative component draws and retains moisture, providing hydration, while the butylene glycol portion further contributes to moisturization, acts as a solvent to maintain ingredient distribution, and can enhance the penetration of other active ingredients.

Research

Clinical Evidence

Low 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

Polyethylene glycols and their derivatives are known for their broad spectrum of viscosity and solubility properties, contributing to product stability. They are generally compatible with neutral, mildly alkaline, and acidic systems, and exhibit good microbiological stability, often reducing the need for extensive preservation.

Safety

Safety Profile

CIR Status
Insufficient data
Sensitization risk Unknown

While PEG-65 Butylene Glycol Isostearate specifically lacks a Cosmetic Ingredient Review (CIR) Expert Panel assessment, related PEG esters and PEGs in general have been deemed safe for cosmetic applications, with the CIR panel removing previous caveats regarding use on damaged skin. However, PEGs can be criticized due to potential contamination with 1,4-dioxane, a byproduct of the ethoxylation process and a suspected carcinogen, leading to their prohibition in organic cosmetics. No specific FDA or SCCS status has been found for this exact ingredient.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Questionable

PEG-65 Butylene Glycol Isostearate is a versatile emulsifier and cleansing agent with skin-conditioning properties, but its specific safety data is limited and the potential for 1,4-dioxane contamination presents a notable concern.

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