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Vitamin B12 absorption occurs primarily in the terminal ileum through intrinsic factor-mediated absorption (for both dietary and supplemental B12) and passive diffusion (particularly relevant for high-dose supplements)

Meanwhile, as noted above, targeted neurological effects may best be achieved with nasal sprays

What Is the Difference Between B12 Injections and B12 Oral Supplements

What caught my attention was the cardiovascular research

it is not for human consumption

Conditions where the bone marrow overproduces blood cells, including polycythemia vera, chronic myeloid leukemia (CML), and hypereosinophilic syndrome , can cause elevated B12 levels