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Wheeler-Kingshott, et al
You may lack vitamin B12 if you dont get enough of this micronutrient in your diet or if you have a digestive system disorder that prevents proper B12 absorption
Endocrine Metabolic & Immune Disorders - Drug Targets, 21 (1), 111130
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It may also occur if your diet is deficient in foods high in vitamin B12 or if you are using drugs that prevent the absorption of this vitamin
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