vitamin b12 deficiency injection side effects Vitamin B12 Injection - Byrons

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High doses (1,0002,000 mcg/day) may be recommended for those with impaired absorption

If you are managing any chronic GI or autoimmune conditions, B12 injections bypass the digestive system altogether, providing a more reliable and effective route to restore healthy levels

When the gastrointestinal tract does not function effectively, it may inhibit the release of B12 from the protein and the absorption that is meant to follow it

Chemotherapy with drugs like 5-fluorouracil has also been associated with acute thiamine deficiency by disrupting thiamine activation, so oncology patients receiving such therapy might receive parenteral thiamine supplementation as part of this B-Complex if needed