GHK Cu, the copper peptide is world renowned for just one thing, and thats for what it does for your skin. It does so much more for your overall well being. If youre trying to start your peptide GHK Cu Peptide: What It Does for Body Composition and Metabolic Health GHK Cu Peptide: Why This Regenerative Peptide Is Getting So Much Attention 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.