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Feagan BG, Greenberg GR, Wild G, Fedorak RN, Par P, McDonald JW, et al

Individuals with digestive system conditions including Crohns disease, celiac disease, or a history of gastrointestinal surgery often have difficulty absorbing B12 orally, regardless of diet

Stover PJ: Physiology of folate and vitamin B12 in health and disease

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