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For an older person on vitamin B12 injections, once the blood level of vitamin B12 has normalized, the injections can be given once a month

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Ask your doctor to evaluate you if you suspect B vitamin deficiencies

[DOI] [PMC free article] [PubMed] [Google Scholar] 31.Sharif N.A

You can learn more in our guide on how to check for a vitamin deficiency

Because gastric absorption rates are unpredictable compared to vitamin B12 injections, according to Foxx, most oral vitamin B12 supplements provide much more than the recommended amount to account for the discrepancy between the dose you take and benefit from (1)