Cu Peptide Before and After: What to Expect for Skin and Hair Biossance Squalane + Copper Peptide Rapid Plumping Serum GHK Cu Peptide Before and After Results Most people think GHK Cu is just a beauty peptide. But look at this Same person. Same lighting. Real skin change. GHK Cu works by activating repair genes in the body helping with 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 Turn back time without filters. GHK Cu Copper Peptides help smooth fine lines, boost collagen, and bring back that healthy, youthful glow.