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Experiences vary
Yes, B12 injections can interact with certain medications or conditions
Methionine, Inositol, Choline + B12
[19] The onset may be vague and slow and the condition can be confused with other conditions, and there may be few to many symptoms without anemia
Observed effects in human trials Reported adverse events across the IV and oral trials included headache, fatigue, dizziness, nasopharyngitis, diarrhea, flatulence, increased appetite, nausea, and back pain
[15] [18] For borderline results, additional tests such as methylmalonic acid, homocysteine, or holotranscobalamin may be considered
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