GHK Cu Copper Peptide Regeneration, Skin Renewal & Anti Age 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. GHK Cu is a small copper bound peptide (glycyl histidyl lysine with a copper ion) found naturally in human tissues and fluids. Its levels decline with age, and it plays a role in tissue repair, regeneration, Rejuvenation and Youth with GHK Cu Peptide Treatment Dr. Ahmet zyigit