In short, our recommended vitamin B12 shot dosage and frequency is around 1 mg per shot, injected daily for at least 90 days
Individuals who benefit most from B12 shots for maintenance are those with adequate overall nutrition who simply need periodic B12 replenishment
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The people who are at the highest risk of B12 insufficiency or deficiency are older adults, those with atrophic gastritis, gastrointestinal disorders, pernicious anemia, those who have had gastrointestinal surgery, vegans, and vegetarians
Often, once injections start, patients discontinue separate oral B supplements, sticking to perhaps just a basic multivitamin or prenatal vitamin at most