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Because the mechanisms don't overlap, some patients use them together as parts of one supervised plan
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
This means B12 deficiency is real and underdiagnosed, but it is not universal and not everyone experiencing fatigue has a B12 problem
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