Any testimonials after using the copper peptide serum?? GHK CU Copper Peptide, Face Serum, 1 oz (30 ml) GHK Cu Peptide Progress: Week 3 Results Top 9 GHK Cu Benefits for Skin, Hair, and Anti Aging Copper uglies = temporary. When you start GHK Cu, you can get a spike in free copper breakouts, texture, irritation. It's not the peptide failing. It's your body adjusting. Happens fast 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