Disclose Medications: Let your provider know about any medications you are taking, especially those for acid reflux or diabetes (like Metformin), as these can interfere with B12 levels
Examining B12 Shots & B12 Injections: Investigating the Definite Relationship Between B12 Injections and Weight Loss, Alongside Alternative Approaches

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A rare case involved a woman who had immediate adverse reactions to both cyanocobalamin and hydroxocobalamin, by both injection and oral delivery