Sodium Polyglutamate Crosspolymer

Sodium polyglutamate crosspolymer is a synthetic polymer derived from the amino acid glutamic acid. It functions as a multi-purpose ingredient in skincare formulations, primarily serving to stabilise emulsions and create protective films on the skin surface.In products, it acts as a binder and thickening agent, helping to maintain the integrity of creams and lotions whilst also providing a conditioning layer that can support the skin's natural moisture retention.

Sodium polyglutamate crosspolymer works through two primary mechanisms. Firstly, its polymeric structure allows it to stabilise emulsions by reducing interfacial tension between water and oil phases, keeping formulations homogeneous during storage and use.Secondly, when applied to skin, it forms a thin, flexible film. This occlusive layer sits atop the stratum corneum and can help minimise moisture evaporation, whilst its amino acid backbone may provide mild conditioning benefits that improve skin softness and suppleness.

This ingredient is typically incorporated into formulations by manufacturers and requires no special application technique from the user. It is generally compatible with most other skincare actives and can be used as part of both morning and evening routines. For best results, apply to clean skin as part of your regular moisturising step.

Sodium polyglutamate crosspolymer is well-tolerated and considered safe for use in cosmetics at permitted concentrations. Allergic contact dermatitis is rare, though those with glutamate sensitivities should patch test first.