What it is
Sodium Polyglutamate is a water-soluble polymer composed of repeating glutamic acid units, commonly produced by fermentation. It is used as a humectant that helps attract and hold moisture at the skin surface and can form a light conditioning film. In sunscreens it contributes to skin feel and hydration rather than to sun protection.
Safety & warnings
A large, water-soluble peptide polymer generally regarded as well tolerated and non-irritating at cosmetic use levels, with a low likelihood of comedogenicity. As with any ingredient, individual sensitivity is possible but uncommon.
Origin & sourcing
Typically produced by microbial fermentation, often using Bacillus species, which yields polyglutamic acid that is then neutralized to its sodium salt; this makes most cosmetic grades biotechnology-derived rather than synthetic or animal-sourced.
Questions everyone asks
How is sodium polyglutamate made?
It is usually produced by bacterial fermentation that yields polyglutamic acid, which is then converted to its sodium salt. This makes it a biotechnology-derived ingredient.
What does it do for the skin?
It acts as a humectant, helping to draw and retain moisture, and can leave a light conditioning film that improves skin feel.