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Somewhere around 1000 mcg of oral vitamin B12 supplement should be enough to treat vitamin B12 deficiency, even in the case of those who do not consume animal foods or lack the intrinsic protein factor or the ability to produce protein intrinsic factor

We will visit the old Library, the Choir, the Main Cloister and the underground crypts known as catacombs

Long-term vegans are a special case, because B12 is one nutrient a plant diet cannot reliably supply

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Several well-established risk factors increase the likelihood of B12 deficiency