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Reference ranges differ between labs
Wendy Wong) Dr
Prompt review is especially important when neurologic symptoms are present
With that said, taking too much oral, intranasal, or intramuscular B12 may cause some of the following symptoms: Headaches Nausea and vomiting Diarrhea Tingling in the hands and feet Fatigue or weakness You should be aware of medication interactions with B12, such as metformin and proton pump inhibitors (PPIs)
doi:10.1210/jc.2017-01155
Type I) ampoules containing 1ml solution for injection
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