The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline Peptides are getting treated like a cheat code online. That is usually where the conversation goes sideways. Because once something gets labelled the Wolverine stack, people stop asking better questions. 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 Peptide for Skin & Hair Facial Serum & Scalp Solution