Glow Peptide Protocol GHK Cu, BPC 157, TB 500 Neurogan Health Okay but Ive only been using GHK Cu for 2 weeks and Im already noticing my skin looking firmer and my fine lines softening. I wasnt expecting to see results this fast but Im loving the glow. DM Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000 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