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Your provider should reassess your B12 levels periodically typically every 3 to 6 months to determine whether continued injections are warranted or whether oral supplementation is sufficient to maintain adequate levels
PMID: 9403790
These amounts are considered safe because the human body, as a general matter, can safely store from 1,000 to 2,000 times the RDA, without negative consequence (anything more will generally be excreted in urine, per NCBI Bookshelf)
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