The best replacement for b12 deficiency is folate deficiency.

The best alternatives to b12 deficiency are rated as following:
★★★★★  folate deficiency
★★★  iron deficiency
★★★  pernicious anemia
★  anemia

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Speaking about b12 deficiency, one probably shouldn't forget about anemia.

Other search terms related to b12 deficiency and their ratings are:
★★★★★ anemia
★★ neurological symptoms
pernicious anemia
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b12 deficiency
folate deficiency
iron deficiency