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They measure the molecule, not what's around it
Symptoms of B12 Overdose: Causes and When to Seek Help Symptoms of B12 overdose are exceptionally rare, as vitamin B12 is water-soluble and excess amounts are typically excreted through urine
Drug/Laboratory Test Interactions Most antibiotics, methotrexate, and pyrimethamine invalidate folic acid and vitamin B12 diagnostic microbiological blood assays
Once blood levels and symptoms improve, the doctor may discontinue the injections and advise maintaining levels with oral supplements or diet
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