OLIGOPEPTIDE-139 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

OLIGOPEPTIDE-139

Safety grade: A

This is a lab-created protein fragment designed to support skin's natural repair processes and improve texture. It works by signaling skin cells to boost collagen and elastin production, helping reduce the appearance of fine lines and promote a smoother, firmer complexion over time.

Graded using: COSING.

Last verified: June 9, 2026