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PEG-50 STEARAMIDE.

Valuable / SURFACTANT - EMULSIFYING

PEG-50 Stearamide is a versatile nonionic fatty acid ester, primarily acting as an emulsifier and surfactant crucial for stabilizing formulations. It enhances product texture and provides conditioning benefits to both skin and hair.

Summary

emulsifying surfactant lubricating agent dispersant conditioning cleansing

Science

Mechanism of Action

As a nonionic mild fatty acid ester, PEG-50 Stearamide functions by reducing surface tension, enabling oil and water to blend harmoniously and stabilize emulsions within a formulation. On the skin, it acts as a lubricating agent to impart softness and smoothness, while also supporting effective cleansing by helping water mix with oily residues and dirt for easy rinsing.

Research

Clinical Evidence

Insufficient-data confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 Clinical safety studies, including Schwartz patch tests conducted on 50 individuals, have consistently shown PEG-50 Stearamide to be neither an irritant nor a sensitizer at concentrations of 25% or greater, with specific testing at 50% reaffirming these findings.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH N/A
0 7 14

Stability

General stability for PEG compounds, including PEG-50 Stearamide, can be affected by warm temperatures, light, and oxygen. Optimal stability for solutions is typically achieved when stored under refrigerated conditions (4°C) or frozen (-20°C). A related PEG exhibited an initial pH of 8.07 at 25°C in stability assessments.

Safety

Safety Profile

CIR Status
Safe as used
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has repeatedly affirmed PEG-50 Stearamide as safe for cosmetic use, with conclusions reaffirmed in 2002 and 2024. Animal tests at 100% concentration showed minimal skin and eye irritation. However, a broader caution for PEG-based preparations advises against use on damaged skin due to observed sensitization and nephrotoxicity in burn patients, though this is not specific to PEG-50 Stearamide. The FDA has approved related PEG-8 Stearate as an indirect food additive and defoaming agent, and PEG-50 Stearate is listed for safe use in textiles that contact food.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

PEG-50 Stearamide is a valuable ingredient for enhancing formulation stability, texture, and providing mild conditioning benefits, backed by a strong safety profile for healthy skin.

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