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Most antibiotics, methotrexate, and pyrimethamine invalidate folic acid and vitamin B12 diagnostic microbiological blood assays

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Interestingly, low blood levels of vitamin B12 have been linked with reduced bone mass, though clinical trials have not definitively supported the efficacy of B vitamin supplements in treating fractures ( Recent research states that the role of vitamin B12 and bone health is not well established

[9] Visual disturbances have been reported in patients with Leber hereditary optic neuropathy, and rapid B12 administration may precipitate optic nerve atrophy in this genetically predisposed population, mandating extreme caution or alternative therapy