RH-POLYPEPTIDE-4 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

RH-POLYPEPTIDE-4

Safety grade: A

This is a lab-made protein compound designed to help skin retain moisture and improve texture. It works by forming a protective layer on the skin's surface, which can help reduce the appearance of fine lines and keep skin feeling softer and more supple throughout the day.

Graded using: COSING.

Last verified: June 9, 2026