NONAPEPTIDE-13 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

NONAPEPTIDE-13

Safety grade: A

Nonapeptide-13 is a small chain of amino acids (the building blocks of proteins) that is created in a laboratory. It mimics natural peptides found in skin to help strengthen and protect hair and skin.

This ingredient works by strengthening the hair and skin barrier, helping to reduce damage, improve moisture retention, and protect against environmental stressors.

Graded using: COSING.

Last verified: May 26, 2026