A copper peptide is a short chain of amino acids bound to a copper ion. The best known is GHK-Cu, which your body produces naturally — it's present in blood plasma, and levels drop substantially between your twenties and your sixties. That decline is most of why it became interesting to researchers: it's not a foreign compound, it's one the body makes less of over time.
Skin gets its firmness from a structural matrix underneath the surface — collagen, elastin and related proteins. Copper peptides are studied for how they interact with the processes that build and maintain that matrix. This is a structural conversation rather than a surface one, which is what separates it from topical skincare: the research interest is in the layer that determines firmness, not the layer you can see.
GHK-Cu on its own is the copper peptide by itself. GLOW adds two recovery peptides, on the reasoning that skin quality and tissue repair draw on overlapping processes. KLOW adds a fourth, KPV, which is studied around inflammatory signalling. Which one fits depends on whether your goals sit purely with skin or extend into recovery and inflammation as well.
The copper peptide
Three-peptide skin blend
Four-peptide blend with KPV
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