Section 03
Cosmetic Peptides
The peptides you see on labels — GHK-Cu, Matrixyl, Argireline and more — explained one by one, with what each can and can't really do.
Peptides and Niacinamide: Can You Use Them Together?
Yes. Peptides and niacinamide get along fine.
Argireline Explained (Acetyl Hexapeptide-8)
Argireline is the brand name for a peptide called Acetyl Hexapeptide-8. A peptide is a tiny piece of protein.
Matrixyl Explained (Palmitoyl Pentapeptide-4)
Matrixyl is a brand name for a group of peptide ingredients — most often Palmitoyl Pentapeptide-4, with newer versions like Matrixyl 3000 and Matrixyl Synthe'6 mixing different peptides. It's sold to help fine lines look softer and skin look firmer.
GHK-Cu (Copper Peptides) in Skincare
GHK-Cu is a tiny natural peptide (three building blocks: glycine, histidine, lysine) linked to a bit of copper. In skincare it's used as a 'carrier' peptide, and it's one of the better-studied peptides for helping skin look firmer and smoothing fine lines.
What Are Cosmetic Peptides?
Cosmetic peptides are tiny protein building blocks added to skincare like serums and creams. They're used to help your skin look better — smoother, firmer, or more hydrated.
Get the free Peptide Skincare Guide
A simple, free PDF: what peptides do, which ones are worth your money, and how to read a label without getting fooled. No hype, no spam.