Wellness peptide craze: why people are injecting drugs 'not for human consumption' 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, Buy Peptide Serum FOXO4 today Peptide Serum Clinic GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B And we're back with our GHK Cu peptide injection pen. Here's how to use it, and where. More coming soon ;) #ghkcu #ghkcucopperpeptide #peptides