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Also referred to as mecobalamin injection, methycobal injection, or inj methylcobalamin, this treatment is essential for healthy nerve function, red blood cell production, and brain health

Vibe 1 mg tablets (equivalent to 1,000 g) is a medicine for the long-term treatment of anemia caused by vitamin B12 deficiency (pernicious anemia) after blood levels have been stabilized following treatment with vitamin B12 injections

Regarding plasma B12 - this is not the case, serum B12 often remains highly elevated (well over the normal range) even while symptoms return - this is why testing B12 once treatment begins is not recommended

doi:10.1093/rheumatology/41.10.1163

If you are otherwise healthy and eat a well-balanced diet that includes foods rich in, or fortified with vitamin B12, it is unlikely that you need additional B12, either as vitamin tablets or injections