NONAPEPTIDE-12 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

NONAPEPTIDE-12

Safety grade: A

Nonapeptide-12 is a small protein fragment made up of nine amino acids linked together. It's designed to strengthen and protect hair while also helping to protect skin from damage.

This ingredient works by conditioning hair to make it softer and more manageable while also providing protective benefits to skin against environmental stressors and damage.

Graded using: COSING.

Last verified: May 26, 2026