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Reported intake or a recent injection is the likely cause, since oral supplements, fortified products, and injected B12 are the most common reasons for a high value

In the UK, cyanocobalamin is commonly used for oral supplementation due to its stability and effectiveness, whilst hydroxocobalamin injections are the preferred treatment for confirmed deficiency, particularly in pernicious anaemia or malabsorption conditions

But blood levels of B12 mean little, and theyll rise regardless of therapeutic effectiveness

Similarly, anyone experiencing unexplained fatigue, weakness, neurological symptoms (such as numbness, tingling or problems with balance), or difficulty losing weight despite appropriate lifestyle measures should consult their GP

This is a hypothetical configuration in pre-publication research literature