POLYGAMMA-GLUTAMIC ACID is graded A (Safe) by Expert·ING, based on COSING regulatory data.

POLYGAMMA-GLUTAMIC ACID

Safety grade: A

This is a natural amino acid compound that works like a moisture magnet for your hair and skin. It helps lock in hydration and creates a protective layer on the hair shaft.

This ingredient hydrates and conditions hair by attracting moisture, while also forming a protective film that smooths the hair surface and reduces frizz.

Graded using: COSING.

Last verified: May 26, 2026