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Vitamin B12 deficiency is primarily caused by autoimmune pernicious anemia, dietary restrictions such as vegetarian or vegan diets, and medical conditions that interfere with absorption such as celiac and Crohns disease
Assessing the Good, Bad, and Alternative
Chandyo RK, Ulak M, Kvestad I, Shrestha M, Ranjitkar S, Basnet S, Hysing M, Shrestha L, Strand TA
Two chemistry-specific cautions apply
Vitamin supplements are very popular
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