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Unlike many other vitamins, it is naturally found primarily in animal-based foods (meat, eggs, dairy, shellfish)

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NTvG 2002;146: 459-64 5

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The UK government says adults need 1.5 micrograms (mcg) a day and the European Food Safety Authority says 4mcg a day is adequate

In the upper small intestine where the pH changes to less acidic conditions, haptocorrin is degraded by pancreatic proteases, releasing B12 which subsequently becomes bound to gastric intrinsic factor (IF) to form the IFB12 complex