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IM injections are the standard for rapidly restoring B12 levels, particularly in severe cases and patients with absorption issues
In most cases, yes
Doctors will adjust doses based on B12 level checks
While not every person benefits, and while nausea often resolves on its own after 2-3 weeks on a stable dose, any intervention that improves tolerability increases the likelihood that users remain on treatment long enough to achieve meaningful results
PMID 14636871
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