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A common protocol for patients with a B12 deficiency may be 1,000 mcg daily for one week, then the same dosage once weekly, and then the same dosage once per month after the deficiency has been addressed

A comprehensive review in Nature Reviews Disease Primers described B12 deficiency as a significant and underrecognized public health concern, particularly among older adults, individuals with gastrointestinal conditions, and those following plant-based diets (Green et al., Nat Rev Dis Primers , 2017)

Katheriya, G., Chaurasia, A., Khan, N

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But according to a 2011 study , vitamin B12 overdose might paradoxically produce many of the same symptoms as deficiency