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Other risk groups include older adults, pregnant women, people taking metformin or long-term acid-suppressing medications (PPIs, H2 blockers), those with conditions affecting the gastrointestinal tract (pernicious anaemia, Crohn's disease, coeliac disease), and individuals who have undergone gastric or ileal surgery
Nayana Shetty, MBBS, MD When to See a Doctor Although rare, some people may experience side effects of high vitamin B12 levels such as headaches or skin reactions
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