OLIGOPEPTIDE-239 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

OLIGOPEPTIDE-239

Safety grade: A

This is a lab-made protein fragment designed to help improve skin texture and firmness. It works by signaling your skin to maintain its natural structure and elasticity. You'll typically find it in anti-aging serums and moisturizers aimed at reducing fine lines and keeping skin looking smoother.

Graded using: COSING.

Last verified: June 9, 2026