vitamin b12 injection or oral B12 Injections vs. Oral Supplements:
Description
If there is clinical improvement and if a reticulocyte response is observed, the same amount may be given on alternate days for seven doses, then every three to four days for another two to three weeks

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Storz et al

Without adequate B12, nerves can become damaged, leading to symptoms such as numbness, tingling, burning pain, and weakness
