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Who should avoid it, warning signs to watch for, and what to know before combining it with other compounds
iron or folic acid deficiency
For keeping levels up, shots are usually given monthly
Those with diseases that affect the gut, such as Crohns disease or celiac disease, are also at risk ( Summary Those at greatest risk of vitamin B12 deficiency are vegans and vegetarians, who get little to no B12 from the diet
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