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Cyanocobalamin is the most stable and least expensive form of B12, widely used in oral supplements and injections
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This system is why the oral Tolerable Upper Intake Level sits at 10 mg/day while typical dietary intake is 11.6 mg/day there is substantial regulated headroom, because the gut and liver are actively managing the load
Anyone with a history of stomach ulcers or gastrointestinal bleeding faces an elevated risk of recurrence
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