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Unlike oral B12, which depends on intrinsic factor and healthy gut absorption, the injection delivers B12 directly into the bloodstream
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
You can read more about ferritin and Hashimotos here
This includes kids, older adults, pregnant and nursing moms, and those with kidney or liver problems
Nat Rev Immunol 10: 490-500
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