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This uncertainty further complicates any assessment of combined use
Hospira initiated this recall due to lack of confirmation of sterilization for some vials from this lot
To help bypass any barriers to absorption in the GI tract, many healthcare providers recommend B12 injections for deficiency, but research shows that very high doses of oral B12 (1,000 to 2,000 mcg once a day) can normalize serum B12 levels to a similar extent with minimal side effects
Neuroscience Letters
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