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A Cochrane review comparing oral and intramuscular B12 found comparable effects on blood levels, and the same principle of good absorption applies to the subcutaneous route
The goal is to find a balance where the benefits of the medication outweigh the side effects
4 Aside from those with genetic methylation defects in the metabolism of vitamin B12 and folic acid, our patients have excellent results with a sublingual vitamin B12 that dissolves slowly under the tongue
This medication is administered as a once-weekly injection
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