ghk-cu peptide benefits mechanism as a multifunctional copper peptide: synthesis routes, process engineering and emerging applications | Systems Microbiology and Biomanufacturing Copper peptide GHK-Cu - Wikipedia
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They may say its okay to stay on your multivitamin, itll just ensure youre getting everything else too, or they may prefer you stop it during injection treatment to accurately assess what the injection alone is doing for you
doi:10.1194/jlr.S092007

doi: 10.1016/0002-9343(81)90392-2

doi: 10.1124/jpet.104.070516 99 Chidambara MurthyKNJayaprakashaGK
Most people notice initial improvements, like better hydration and a healthier glow, within the first month