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Your diet is another major factor
Fortunately, there is increasing evidence that oral B12 supplements are just as good as injections for raising blood levels in most people ( Vegetarians and vegans are usually advised to take at least 10 mcg per day, or at least 2,000 mcg once per week ( However, some doctors still prefer the use of injections
Several conditions and situations can cause it, such as wearing tight clothing, pregnancy and direct injury to your nerve
When administered by a licensed professional in a sterile environment, B12 injections are considered very safe
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