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Always confirm against the manufacturer's specific instructions for your vial
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References Rosamond W, Flagel K, Friday G, Furie K, Go A, Greenlund K, Haase N, Ho M, Howard V, Kissela B, Kittner S, Lloyd-Jones D, McDermott M, Meigs J, Moy C, Nichol G, O'Donnell CJ, Roger V, Rumsfeld J, Sorlie P, Steinburger J, Thom T, Wasserthiel-Smoller S, Hong Y, American Heart Association Statistics Committee and Stroke Statistics Subcommittee: Heart disease and stroke statistics2007 update: a report from the American Heart Association Statistics Committee and Stroke Statistics Subcommittee
10.1038/165921a0 177 ElliottA.AmbroseE.RobinsonC
Adverse reactions reported following methylcobalamin administration include headache, infection, nausea/vomiting, paresthesias, and rhinitis