RH-POLYPEPTIDE-21 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

RH-POLYPEPTIDE-21

Safety grade: A

This ingredient is a lab-created protein that helps strengthen and support your skin's natural structure. It works by boosting the skin's ability to stay firm and elastic, making it a popular choice in anti-aging and firming skincare products.

Graded using: COSING.

Last verified: June 9, 2026