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Moumoujus

PEG-16 SOY STEROL.

Valuable / SURFACTANT - EMULSIFYING

PEG-16 Soy Sterol is a polyethoxylated derivative of soybean sterols, functioning as a multifunctional ingredient that enhances formulation stability and offers direct skin conditioning benefits. It is valued for its emulsifying capabilities and its ability to improve skin moisture retention and smoothness.

Summary

Emulsifying Skin Conditioning Surfactant Cleansing Solubilizing

Science

Mechanism of Action

This ingredient primarily acts as a nonionic surfactant and emulsifying agent, reducing surface tension to facilitate the formation and stability of oil-in-water emulsions. It also serves as a skin conditioning agent, enhancing the appearance of dry or damaged skin by reducing flaking and restoring suppleness through improved moisture retention and lipid replenishment. Furthermore, its soybean sterol components contribute antioxidant protection against oxidative stress.

Research

Clinical Evidence

Medium confidence
Effective range 0.75–2%
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Both
Optimal pH 4.5 – 7
0 7 14

Stability

As a nonionic emulsifier, PEG-16 Soy Sterol is generally stable across neutral, mildly acidic, and mildly alkaline systems, with an optimal pH range noted between 4.5 and 7.0 in aqueous dispersions. It is typically supplied as an ivory-colored, hard wax.

Conflicts

  • Should not be used on damaged skin

Safety

Safety Profile

CIR Status
Safe as used
Max tested
2%
Sensitization risk Low

The CIR Expert Panel has concluded that PEG-16 Soy Sterol, alongside other PEG Soy Sterol derivatives, is safe for use in cosmetic products at concentrations up to 2%. However, due to observed systemic toxicity and sensitization when PEGs are applied to severely compromised skin, usage on damaged or burned skin is explicitly not recommended. Manufacturers are advised to control for trace amounts of 1,4-dioxane, a potential byproduct of the ethoxylation process, through purification steps.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

PEG-16 Soy Sterol is a valuable ingredient, offering robust emulsifying capabilities and significant skin conditioning benefits, making it highly suitable for a diverse range of cosmetic formulations and skin types.

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