Copper peptide GHK Cu Wikipedia 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. The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? GHK Cu as a multifunctional copper peptide: synthesis routes, process engineering and emerging applications Systems Microbiology and Biomanufacturing Springer Nature Link Definitive Guide on Peptides for Skin and Hair Care Infusion Clinic ABQ