Peptide Therapy for Pain Management and Healing Core Medical & Wellness Definitive Guide on Peptides for Skin and Hair Care Infusion Clinic ABQ Should Bodybuilders Take GHK Cu? Neurogan Health What is GHK Cu and Why is Everyone Talking About It? GHK Cu (Copper Peptide) is a powerful, naturally occurring compound in the body that plays a key role in skin health 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.