GHK Cu Copper Peptide Neck & Face Serum The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline Guidelines for GHKCU Use: Bruising and Stinging Solutions TikTok Before you decide to begin using the copper peptide, GHK Cu, be aware it stings and leaves behind big, red welts that then leave a lovely bruise. In order to reap the 'glow' GHK Cu is a copper peptide known for supporting skin repair, collagen production, and overall tissue healing., Traditionally, its taken as an injection but that can come with irritation, bruising, or GHK Cu is a fantastic peptide but it can burn or bruise some people. Quick options to help reduce that issue. #ghk cu #copperpeptides #KLOW #GLOW #peptides