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Deficiencies of vitamin B12 are fairly common but it is difficult to know if you are deficient
You can find this nutrient in foods such as meat, fish, and dairy products
Medications can also influence B12 metabolism
Other people needing shots include those who have had gastrointestinal surgery if their digestive system cannot absorb vitamin B12 efficiently
Without enough B12, you may feel weak, tired, or forgetful, and it can affect your overall health
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