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A 2024 study found deficiency prevalence ranges from 5% to 52% in vegans, with the wide gap reflecting differences in supplement use

Resources We Trust Cleveland Clinic: A Nutritional Plan for Anyone Living With Crohns Disease or Ulcerative Colitis Mayo Clinic: Anemia American Society of Hematology: Patient Groups Crohns & Colitis Foundation: Join the Community Crohns Colitis Canada: Fatigue Anemia Fact Sheet

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Asymptomatic : In asymptomatic patients with risk factors (see Table 1: Patient Risk Factors Associated with B 12 Deficiency above) consider supplementation in lieu of testing