Glow Peptide Injection: Revolutionizing Skin Rejuvenation Hubmed GHK Cu Topical vs Injection Which is the Better Copper Peptide Form? 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 The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline