PENTAPEPTIDE-59 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

PENTAPEPTIDE-59

Safety grade: A

This is a lab-created protein fragment made up of five amino acids linked together. It's used in skincare products to help improve skin texture and appearance by promoting firmness and smoothness. It works by interacting with skin cells to support a more youthful-looking complexion.

Graded using: COSING.

Last verified: June 9, 2026