TETRASODIUM DISUCCINOYL CYSTINE is graded A (Safe) by Expert·ING, based on COSING regulatory data.

TETRASODIUM DISUCCINOYL CYSTINE

Safety grade: A

This is a modified amino acid derived from cystine, a naturally occurring compound found in hair and skin. It's been chemically processed and bonded with succinic acid to create a conditioning agent that helps improve hair texture and strength.

This ingredient conditions and strengthens hair by helping to repair damage, improve elasticity, and create a smoother hair surface that reduces frizz and enhances shine.

Graded using: COSING.

Last verified: May 26, 2026