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60 , 61 Vitamin B 12 deficiency may induce macrocytosis, peripheral neuropathy, ataxia, dizziness, cognitive disturbances, depression, delirium, psychosis, paralysis, muscle cramps, fibromyalgia-like symptoms, and fatigue

Vitamin B12 injections may be more beneficial for those seeking an instant energy boost and help with specific medical conditions, such as anemia

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Darimont C, Zbinden I, Avanti O, Leone-Vautravers P, Giusti V, Burckhardt P, Pfeifer A, Mace K

Medication Interactions Certain medications reduce the absorption of methylcobalamin, cyanocobalamin, and other B12 supplements, including: Proton pump inhibitors (omeprazole, esomeprazole, and lansoprazole) H2-receptor antagonists (cimetidine, famotidine, and ranitidine) Metformin Colchicine Cholestyramine Certain antibiotics (neomycin and chloramphenicol) If you use these or other medications, talk with a healthcare provider about ways to maintain healthy levels of B12.