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However, other methods (such as injection) can be considered more effective due to direct delivery
When designing combination protocols, researchers should account for possible interactions, adjust doses, use enhanced safety monitoring, and include appropriate controls
Summary: Vitamin B12 toxicity from supplementation is extremely rare, but persistently elevated serum levels may indicate underlying liver disease, kidney dysfunction, or haematological disorders requiring medical investigation
Older people usually produce less stomach acid and therefore less intrinsic factor, increasing their risk for deficiency
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