How Long Does GHK Cu Last? Half Life, Results & Shelf Life SeekPeptides GHKCU GHK Cu is a naturally occurring copper peptide found in the body that plays a key role in regeneration and repair. It supports collagen production, which helps improve skin How long will a 50 mg supply of GHKCu last when dosing 2 mg daily for five consecutive days followed by two days off each week? GHK Cu Copper Peptide for Research GhostLabz GHK Cu (50mg) Your Peptide Brand