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Some products may be compounded or prescribed off-label based on individual assessment
In that case, the doctor may prescribe vitamin injections or oral supplementation of the vitamin to increase its levels
The wide range reflects individual variation in requirements and the difficulty of over-dosing b12
Also searched were the Agency for Healthcare Research and Quality evidence reports, Clinical Evidence, the Cochrane database, Essential Evidence, the Institute for Clinical Systems Improvement, the National Guideline Clearinghouse database, and the U.S
Nor is there any concern that cyanocobalamin will not convert to methylcobalamin
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