How much GHK Cu should I inject daily? GHK Cu (100 MG) Sigma Compounds GHRP 6 Peptide Growth Hormone & Regeneration Research Research chemicals known as peptides, many of them banned by the World Anti Doping Agency and some not approved for human use in the United States, are available with the simple click of Why is the injection site painful after administering GHK Cu (Glycyl L Histidyl L Lysine Copper) 2mg mixed with normal saline? Frontiers Somatostatin receptors in congenital hyperinsulinism: Biology to bedside