Sodium Polyglutamate

What is Sodium Polyglutamate?

Sodium polyglutamate is the sodium salt of polyglutamic acid, a natural biopolymer made of multiple glutamic acid units linked together. It is typically produced via fermentation using bacteria like Bacillus subtilis, mimicking processes found in natto, a traditional Japanese food. In cosmetics, it appears in moisturizers, serums, creams, and hair products. Functionally, it acts as a humectant by drawing moisture from the environment into the skin and hair, while forming a thin, flexible film that locks in hydration and reduces evaporation. This helps maintain suppleness without greasiness. As a conditioning agent, it smooths surfaces by reducing friction, improving texture and manageability. Its high water-binding capacity surpasses some common moisturizers, supporting overall product efficacy in hydration-focused formulations.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1 View on EWG →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Hair conditioning
Improves softness, shine, and manageability by reducing friction and static; commonly achieved with cationic agents, silicones, oils, or conditioning polymers.
Skin conditioning agent
Maintains skin softness, smoothness, and flexibility.
Humectant
Attracts and holds water in the stratum corneum, boosting hydration and plumpness; commonly used in moisturizers, cleansers, and hair conditioners.

Benefits

Enhances moisture retention for softer, plumper skin.

Smooths and conditions hair, reducing tangles and static.

Boosts product hydration without heavy residue.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
Individuals with dry or dehydrated skin seeking deeper moisture.
Anyone with rare allergies to glutamic acid derivatives.
People with frizzy or dull hair needing conditioning.
People sensitive to fermented ingredients, though uncommon.
Those preferring biotech-derived, water-attracting ingredients.
Those preferring strictly plant-based over microbial sources.

Safety Notes

  • Rated low hazard by independent safety assessments.
  • Non-comedogenic, unlikely to clog pores.

Frequently Asked Questions about Sodium Polyglutamate

What makes Sodium Polyglutamate effective for hydration?

It binds large amounts of water and forms a moisture-locking film on skin and hair.

Is it suitable for sensitive skin?

Yes, it has a low irritation profile based on safety evaluations.

How does it differ from hyaluronic acid?

It holds more water per molecule and provides film-forming conditioning.