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Storage duration critically impacts effectiveness - reconstituted GHK-Cu lasts only 21-28 days refrigerated due to copper oxidation concerns (shorter than most peptides), requiring strategic reconstitution of amounts usable within this window rather than preparing entire vials at once
10.1038/cr.2016.95 47 GaoM.MonianP.QuadriN.RamasamyR.JiangX
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Optimal B12 absorption depends on selecting the right injection site
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