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Extrapolating from B12 supplementation trials of non-vegans to determine the needs of vegans is complicated by the fact that a high percentage of any small dose of B12 is absorbed and omnivores are normally receiving numerous small doses throughout the day

The Schilling test, which was previously used to diagnose pernicious anemia, is no longer available in the United States, and testing for elevated levels of anti-intrinsic factor antibodies and elevated serum gastrin or pepsinogen is recommended

[PubMed: 10845097] 7

Administering regular B12 injections can help the regeneration of the myelin sheath and protect the nerves