According to the National Institutes of Health (NIH): Most people in the United States get enough vitamin B12 from the foods they eat
Intensive Loading Dose Protocols For severe B12 deficiency, a high-dose treatment is often needed
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Well, normally this vitamin is absorbed in the gut and so a disruption to normal gut function will reduce the amount of vitamin B12 that's being absorbed by the intestines and that will lead to a depletion of the normal body stores, which will then result in a deficiency in this vitamin within the body as a whole
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