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A serum B12 level test and, ideally, a methylmalonic acid (MMA) test should precede any B12 injection recommendation
In a state of vitamin B 12 deficiency, the cell responds by redirecting folate metabolic pathways to supply increasing amounts of methyltetrahydrofolate
Insulin syringes are marked in units rather than milliliters
injections are chosen for rapid repletion or malabsorption
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