When it comes to supplements, taking high doses of vitamin C at the same time as your B12 shot might slightly lower the amount of B12 your body can use, but this is more relevant for oral B12 supplements than injections
Explore the Good, Bad, and Alternative Aspects of B12 Injection Why
Further evidence that the two proteins interact is provided by size-exclusion chromatography multi-angle light scattering measurements, which show dissociation of the Ab DGC dimer into monomers upon addition of the photocobilin domain ( Ab Pcob)
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Topical delivery puts far less copper into the body than oral or intravenous routes, and the skin barrier limits absorption, so the systemic exposure from a copper-peptide serum is plausibly low