Experiencing itching & burning from your GHK CU peptide injections? Try these to hacks: 1. Use a longer syringe to penetrate deeper into the fat cells. 2. Dilute the copper. Here I The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline Recent post responses making me question if my reactions are normal. Worried! : r Peptides Copper peptides explained what are the differences between copper peptides and GHK CU peptides? What they actually do for the skin in terms of repair and collagen, and what you can and cant mix