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Neural Regeneration Research, 2022, 17 3: 482-487

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Food and Drug Administration) Dietary deficiency of vitamin B 12 occurring in strict vegetarians and in their breastfed infants (isolated vitamin B 12 deficiency is very rare) Malabsorption of vitamin B 12 resulting from damage to the stomach, where intrinsic factor is secreted, or damage to the ileum, where intrinsic factor facilitates vitamin B 12 absorption

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The Role of Ammonia and Histamine Certain bacterial strains produce ammonia, which in excess becomes neurotoxic