GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? GHK Cu is one of the most talked about peptides in aesthetics right now. But how much of what you have heard about it is actually true? Copper peptide, known as GHK Cu, has GHK Cu Peptide: Why This Regenerative Peptide Is Getting So Much Attention Ever heard of GHK Cu peptide? It's a naturally occurring copper peptide that helps repair tissue, stimulate collagen, and support skin healing. When used in injectable form, it works at a deeper level GHK CU Apollo Peptide Sciences