Rapid: If you are B12 deficient, the anemia will improve and reticulocyte count rise within a week. If your have a neurologic deficit, you'll notice an improvement in a week or two. If you're being given B12 as a placebo or part of a "natural healing" scheme, there's no answer as it's not benefiting you beyond the power of suggestion. Be sure you understand why and whether it's long-term.
Answered 7/1/2018
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