ghk cu injection adverse effects case report Peptide and GHK GHK-Cu Peptide Injection Before and
Description
What this implies: if the vial remains sealed, in a cool, dry, dark place (ideally under refrigeration or freezing, with minimal humidity), you can reasonably expect 2-3 years of viability in the lyophilized state

Because fasted-state absorption allows the peptide to bind NNMT enzymes without interference from competing substrates in the gut

Finally, safety is paramount

PMC 3472060
Translational durability and long-term safety remain unresolved