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Moumoujus

HYDROXYPROPYL STARCH.

Valuable CAS 9049-76-7 / 68584-86-1 / VISCOSITY CONTROLLING

Hydroxypropyl Starch is a modified carbohydrate polymer widely used to improve the sensory profile and stability of skincare formulations. It functions as a versatile texturizer and film-former, enhancing product aesthetics and application. This ingredient also contributes to skin hydration by minimizing moisture loss, and can help balance greasiness, particularly for oily skin types.

Summary

Thickening agent Stabilizing agent Film former Humectant Texture enhancer Moisture retention Sebum control Viscosity modifier

Science

Mechanism of Action

This modified starch functions primarily as a rheology modifier, increasing viscosity and stability within formulations, leading to a smoother, more spreadable texture. The introduction of hydroxypropyl groups enhances its hydrophilic nature, allowing it to expand readily and form a delicate, breathable film on the skin. This film acts as a mild occlusive barrier, reducing transepidermal water loss (TEWL) and supporting moisture retention. For individuals with oily skin, it helps absorb excess sebum, contributing to a less greasy and more conditioned after-feel.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH 5 – 8
0 7 14

Stability

Hydroxypropyl Starch's modification enhances its solubility in cold water and confers improved stability across a broad range of pH and temperature conditions. It exhibits increased resistance to thermal degradation, microbial activity, acids, alkaline environments, and enzymatic breakdown. Formulations typically maintain optimal stability and viscosity within a pH range of 5.0 to 8.0 for a 10% solution, demonstrating good fluidity and excellent freeze-thaw stability.

Safety

Safety Profile

CIR Status
Not reviewed
Sensitization risk Low

Hydroxypropyl Starch (E1440, CAS 9049-76-7) is generally considered safe for cosmetic applications. It has been classified by EWG with low concerns across categories including cancer, allergies & immunotoxicity, and developmental & reproductive toxicity. Environment Canada indicates it is not expected to be toxic or harmful. It is also approved as a food additive (GRAS E1440) in the US and EU. While the Cosmetic Ingredient Review (CIR) has assessed related 'starch phosphates' as safe, a specific, standalone CIR report for 'Hydroxypropyl Starch' itself is not currently available.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

Hydroxypropyl Starch is a valuable, well-tolerated ingredient that significantly enhances product texture and stability while offering skin hydration and a refined feel across multiple skin types.

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