Sodium Carboxymethyl Starch

Sodium carboxymethyl starch is a modified polysaccharide derived from starch. It is created by chemically treating natural starch to introduce carboxymethyl groups, which increase its water-binding capacity and stability. In skincare, it functions as a multitasking ingredient: it stabilises emulsions (helping oils and water blend smoothly), thickens formulations to the desired consistency, and forms a lightweight film on the skin surface.This ingredient is valued in cosmetic formulation because it is derived from natural sources, readily biodegradable, and gentle. It allows formulators to c…

Sodium carboxymethyl starch works through its polysaccharide structure, which contains numerous hydroxyl groups with a strong affinity for water molecules. When applied to skin, these groups attract and bind water, helping to maintain hydration at the skin surface. This hygroscopic behaviour is what makes it effective in moisturising formulations.Within a formula, the ingredient acts as a thickening and stabilising agent by increasing viscosity and preventing oil and water phases from separating over time. This creates a more stable, homogeneous product that delivers consistent results with…

Sodium carboxymethyl starch is a formulary ingredient, so you will not typically encounter it as a standalone product. Look for it in moisturisers, serums, and masks where it contributes to hydration and product texture. It works well alongside other hydrating ingredients like glycerin or hyaluronic acid, and is compatible with most skincare routines. Use as directed on the product label.

Sodium carboxymethyl starch is generally well-tolerated and considered safe for topical use in cosmetics. It has a low sensitising potential, making it suitable for sensitive skin types. No significant cautions are documented at typical cosmetic concentrations.