GHK Cu Peptide Serum: Copper Peptides for Skin Firmness Mythos Mythos Skincare GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy Heard of the copper peptide everyone's talking about? Here's the quick breakdown: GHK Cu is a naturally occurring peptide in your body that binds with copper. As we age, levels drop and that's 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. Copper peptide GHK Cu Wikipedia