In life-threatening cases of cyanide toxicity, 5,000,000g of B12 is injected
This deficiency can cause anemia and in some cases, permanent neurologic damage
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Patients with a history of gastrointestinal issues including gastritis, acid reflux treated with PPIs, or any condition affecting stomach lining integrity already have compromised B12 absorption pathways
For many people, injections are the most effective way to manage a deficiency, particularly where absorption from tablets is limited
No severe hypoglycemia or serious treatment-related adverse events reported in trials [1] [2]