GHK Cu (Copper Peptide) Lyophilized LeadWest Medical Most peptides don't come ready to inject they come as powder for a reason. Peptides are lyophilized (freeze dried) to keep them stable and effective. When you receive them, you simply: Add How Long is GHK Cu Good For SeekPeptides If you've ever felt lost trying to reconstitute GHK Cu, this one's for you. I walk you through how I prep it step by step, including transferring it to a larger vial. Think of this