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Key comparisons between B12 injections and B12 supplements: Effectiveness & Speed Injections bypass the digestive system, providing immediate, high-dose availability, which is crucial for reversing severe symptoms quickly
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
There is no risk of dangerous overdose from typical multivitamins alongside the shot, but any more than that (like multiple high-dose supplements) should be avoided
