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Vascular issues Though rare, overuse of therapeutic B12 may lead to vascular events: Clots in deep veins Swelling in the legs Risk of pulmonary complications in sensitive groups Tabular View for Quick Recap You should report symptoms early to stop things from getting worse
If you regularly work out and do strength training, B12 injections might be key to enhancing your strength
References : Office of Dietary Supplements, NIH
[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
Because conditions like pernicious anemia are lifelong, prescription B12 therapy is often indefinite
