Deficiency is particularly common in elderly people, because the ability to absorb vitamin B12 can decrease with age ( Other people at risk of deficiency include those who have had intestinal surgery, including weight loss surgery
Some of the symptoms of having a deficiency in vitamin B12 include low moods, difficulty concentrating, pale skin, brittle nails, loss of sensations in the hands and feet and many more
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It's taken orally , not via injection, and it has no known toxicity or adverse effects
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