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They aren't supplying B12 for any medical condition, so they don't have to worry about what they sell going off
While Vitamin B12 injections can help improve energy levels, its important to rule out any underlying medical conditions contributing to your symptoms
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
Just as vitamin B-12 deficiency causes unpredictable results, too much of it can also cause unknown results
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