GHK Cu Topical vs Injection Which is the Better Copper Peptide Form? Absence of evidence isnt evidence of absence its a popular argument, but its not how we should be guiding treatment decisions. In this short, I respond to a comment about GHK Cu injections for Injectable GHK Cu: Beginner's Guide to Copper Peptide GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy Subcutaneous Injection: What It Is and How to Give One The tripeptide GHKCu complex ameliorates lipopolysaccharideinduced acute lung injury in mice Oncotarget