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 GHK Cu Peptide Serum: Copper Peptides for Skin Firmness Mythos Mythos Skincare Super GHK Copper Intensive Cream by Skin Biology Aim For Wellness 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.