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Pharmacies using non-B12 formulations Some pharmacies compound tirzepatide with glycine alone, without B12
But if you just want the fast answer, most research shows GHK-Cu to be the more broadly studied copper peptide for both hair and skin

[DOI] [PubMed] [Google Scholar] 48.Drgan I.G., Vasiliu A., Georgescu E., Eremia N

The two approaches may be complementary rather than mutually exclusive

10.1016/j.biocel.2004.05.009 159 TenevT.BianchiK.DardingM.BroemerM.LanglaisC.WallbergF.et al (2011)
