GHK Cu Purepep Your body made this peptide every day until you turned 30. Then it stopped. GHK Cu (copper peptide) is a naturally occurring tripeptide discovered in 1973. At age 20, your plasma levels sit The Pen: This is why delivery systems matter. For years, peptide therapy relied on lyophilized vials, manual reconstitution, dilution calculations, and insulin syringes. Every step introduced variables, dosing inaccuracies, contamination risk, peptide GHK Cu Copper Peptide Collagen, Skin Rejuvenation & Hair Restoration