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Aging and B12 Deficiency Vitamin B12 deficiency can be caused by a number of factors, including a vegetarian diet, weight loss surgery, celiac disease and Crohns disease
One study showed decreased levels in post-bariatric surgery patients, but this high-risk group had multiple confounding factors
It must not be ingested by humans or animals under any circumstances
To keep your B12 levels healthy over time, you must ensure you get enough B12 from your food or supplements
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