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Certain medications The following drugs can reduce levels of vitamin B12 in your body: Antibiotics -- long-term use can lower vitamin B levels generally Anti-seizure drugs Chemotherapy medicines, especially methotrexate Drugs used to reduce stomach acid, like H2 blockers (Pepcid AC, Tagamet, Zantac) and proton pump inhibitors (Nexium, Prevacid, Prilosec) Metformin (Glucophage) -- taken for diabetes Colchicine -- taken for gout Some cholesterol-lowering medications Other causes You're over 65

It helps maintain the health of nerve cells including those needed for neurotransmitter signaling and helps form the protective covering of nerves, called the cells myelin sheath

Fortified breakfast cereals, fortified plant milks, fortified plant spreads and yeast extracts are also sources of vitamin B12 for vegans

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This puts vegans and vegetarians at a higher risk of deficiency, as plant-based diets lack adequate amounts of this essential nutrient