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But I think this is, is like kind of the question

Like most treatments, vitamin B12 injections carry warnings that patients should be aware of, including: Hereditary Optic Nerve Atrophy: People with early Lebers disease (a hereditary form of optic nerve atrophy) should not receive cyanocobalamin injections, as rapid and severe vision loss has occurred

If your body does not have sufficient B12, then it cannot make energy and so therefore you are weak, tired, or unfocused

1,2,6,18 The recommended laboratory evaluation for patients with suspected vitamin B 12 deficiency includes a complete blood count and serum vitamin B 12 level