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Description
B12 plays a major role in several processes like making red blood cells, converting food into energy, and forming new DNA

Auerbach, M

External and iatrogenic causes: Excessive supplementation: High-dose oral supplements or frequent intramuscular injections (hydroxocobalamin or cyanocobalamin) can elevate serum levels, though this rarely causes problems

Wegrowski, Y., Maquart, F