TETRAPEPTIDE-100 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

TETRAPEPTIDE-100

Safety grade: A

This is a small protein fragment made of four amino acids linked together, designed to help firm and smooth skin by supporting its natural structure. It works by signaling skin cells to strengthen and improve elasticity, helping reduce the appearance of fine lines and wrinkles over time.

Graded using: COSING.

Last verified: June 9, 2026