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Adapted from a Harvard Health Blog post by Patrick Skerrett
Source matters
It is important to distinguish between excessive supplementation and pathologically elevated B12 levels, which may indicate underlying haematological disorders, liver disease, or renal impairment rather than true overdose
Clinical trial data recorded headache as the most frequent adverse event, occurring in a small percentage of participants
An absence of intrinsic factor is the most common cause of pernicious anemia
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