GHK Cu is a powerful copper peptide that supports collagen production, skin and hair health, and tissue repair. It may help reduce fine lines, improve elasticity, and promote faster healing. Want to learn Copper Peptides for Skin: The Science, Benefits, and Best Practices Hubmed GHK Cu Peptide Serum: Copper Peptides for Skin Firmness Mythos Mythos Skincare Copper peptide GHK Cu Wikipedia Copper Tripeptide 1 Skin Benefits: A Simple Guide 7 days on GHK Cu. Here's my honest update. I'm not going to hype this up because the real results don't even start until week 46. But something is already happening.