B 12 injection: If you are deficient in B 12 it is likely to be due to problems with absorption of the vitamin. The only sure way to replace it is by injection of B12, at a minimum of 1000microgrms every three months. Your doctor may try a higher dose or more frequent injection. See this site for more info. http://www.nlm.nih.gov/medlineplus/ency/article/000574.htm
Answered 4/13/2015
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