TETRAPEPTIDE-126 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

TETRAPEPTIDE-126

Safety grade: A

This is a lab-created protein fragment made of four amino acids linked together, designed to help skin appear firmer and more youthful. It works by supporting the skin's natural structure and may help reduce the appearance of fine lines when used regularly in serums and creams.

Graded using: COSING.

Last verified: June 9, 2026