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Oral vitamins must get broken down by the GI tract (through stomach, intestines) then go through the liver for metabolizing.

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That means: Hypokalemia can develop or worsen which can lead to: Cardiac arrhythmias Muscle weakness QT prolongation In severe cases, sudden cardiovascular instability This is a classic board-style pearl that many clinicians forget because B12 feels benign. But in profoundly deficient patientsespecially those with severe megaloblastic anemiarepletion is metabolically active treatment

Its 100mg unit size makes it particularly suited to larger-scale in vitro assays and formulation research