ghk-cu peptide inyectable Injectable GHK-Cu Copper Peptide | Skin
Description
10.1164/ajrccm.151.5.7735596 27 DoyleK.LnnH.KckH.Van de PolA.SwallowS.GardinerP.et al (2016)
Beyond ~28 days, the antimicrobial protection isn't reliable, increasing the risk of contamination in subsequent reconstituted vials

It has to be used as directed to get the most benefit and treat your specific condition
Airless packaging, protected formulation pH, and controlled storage are repeatedly flagged as quality requirements in the formulation-chemistry literature
