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22b.1.3 Absorption and metabolism For the transport into body cells, vitamin B12 is absorbed by either active absorption or passive diffusion
It is a framework for understanding how the mechanisms discussed throughout this guide could theoretically be combined
In other contexts, a trial of high-dose oral therapy is reasonable and less invasive
That is why tests like methylmalonic acid (4) tend to be much more accurate than serum B12 levels
### Seek treatment If you have a B12 deficiency, your healthcare provider may recommend one or more of the following treatment protocols [1]: - Vitamin B12 injection For some patients, the root cause of their B12 deficiency is their bodys difficulty in absorbing and retaining the B12 they consume through food
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