Copper Peptides Before and After: Visible Skin Improvements Explained Hubmed GHK Copper Peptide GHK Cu Tripeptide 1 Biostetix Not everything that stimulates collagen is automatically beneficial in excess. GHK Cu is a powerful regenerative peptide but like many Instagram 12 weeks in, and my skin has NEVER looked better! GHK peptides are doing their thing. Alright, I need to give you an updateit's been 12 weeks since I started using GHK