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If you have a diagnosed B12 deficiencysuch as from pernicious anemia or certain gastrointestinal issuesyour initial treatment may involve weekly B12 injections for several weeks
Common Community-Reported Side Effects Nausea, vomiting, diarrhea, constipation (worst during escalation steps)
The reverse, adding too little water, creates an overly concentrated solution with the same problem in the opposite direction
Additionally, the resistance to microbes weakens after 28 days, despite the appearance of the vial being clean
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