NL GHK Cu in the nervous system Synthagen PL 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 Amazon.com: QUBIT GHK Cu Copper Peptide Supplement for Skin & Hair, Easy to Absorb, Precisely Dosed 90 Vegan Capsules : Health & Household What are the benefits and risks of using GHK Cu (Glycyl Histidyl Lysine Copper) peptide for wound healing and tissue repair? The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline