The GHK Cu pen works. But needles at home were never the answer. We took the same clinically backed copper peptide complex and put it into a serum you can use in 30 seconds, Injectable GHK Cu: Beginner's Guide to Copper Peptide Mitigating GHK Cu Injection Pain: Tips and Tricks Gabriel Alizaidy, MD, MS posted on the topic LinkedIn The tripeptide GHKCu complex ameliorates lipopolysaccharideinduced acute lung injury in mice Oncotarget GHK Cu Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline