Elevated serum B12 levels (hypercobalaminaemia) often serve as a biomarker for serious underlying conditions rather than being directly harmful themselves
Metformin, commonly prescribed for type 2 diabetes, is well-known to cause diarrhoea and is also associated with B12 deficiencymeaning patients may be taking both simultaneously
The NHS symptoms list groups them into general anaemia symptoms (tiredness, breathlessness, headaches, loss of appetite, weight loss) and neurological signs (peripheral neuropathy, balance problems, depression, memory and concentration changes, sometimes mood changes or psychosis in advanced cases)
Understanding NAD+ vs B12 Injections NAD+ vs B12 injections are both used to support energy, but they work differently
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