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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.

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Magnesium There are many types of magnesium, and several of them can help alleviate headaches