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Pathological causes of elevated B12 warrant careful consideration: Haematological disorders : Myeloproliferative neoplasms (polycythaemia vera, chronic myeloid leukaemia), acute leukaemia, and lymphoproliferative disorders can increase B12-binding proteins (transcobalamin and haptocorrin), elevating total serum B12 [3] Liver disease : Hepatocellular damage releases stored B12 into circulation

And its even worse for people who dont inject on a daily basis: Vitamin B12 is water-soluble, so only a tiny bit is absorbed, and the rest is urinated out within hours

Garca-Fernndez M, Delgado G, Puche JE, Gonzlez-Barn S, Cortzar IC

however, a cause and effect relationship remains largely undefined, largely due to the complexity of mucosal barrier structure and function

You cant be entirely sure of what youre getting