GHK Cu Copper Peptide: The Ultimate Peptide For Longevity GHK Cu Hair & Scalp Serum 2400mg 4% Less Shedding Neurogan Neurogan Health Copper Peptide (GHK Cu) 2% Recovery Serum GHK Cu Topical Cream 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 peptides from Transcend, and Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000