Science
Mechanism of Action
On the skin, Sodium Carboxymethyl Starch primarily functions as a textural agent. It effectively increases the viscosity of formulations, contributing to a smoother and more easily applicable product consistency. By acting as an emulsion stabilizer and binder, it prevents the separation of oil and water phases over time, thereby maintaining product integrity. Furthermore, it forms a subtle, breathable film on the skin's surface, which aids in moisture retention and imparts a silky, non-greasy feel. This ingredient also acts as a water-retaining or water-absorbing colloid.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Sodium Carboxymethyl Starch is readily soluble in cold water, producing a viscous, transparent to slightly milky solution. Its aqueous solutions exhibit enhanced stability under alkaline conditions (pH 5.0-9.0). Conversely, stability diminishes in acidic environments, where it can form insoluble free acid, leading to a reduction in viscosity.
Conflicts
- Strong acids (can cause reduced viscosity and insoluble free acid formation)
- Metal salts (can produce white turbidity or precipitation)
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has concluded that Sodium Carboxymethyl Starch is safe for use in cosmetic formulations under current practices, with specific restrictions related to impurities. No definitive maximum concentration has been established, and its safety profile is contingent upon adherence to these impurity limitations.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Sodium Carboxymethyl Starch is a valuable ingredient for improving the textural elegance and stability of a broad spectrum of skincare formulations, while also offering mild hydrating benefits.
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