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Surgical procedures Sometimes few surgeries that involve the removal or alteration of the stomach or intestines can affect the bodys ability to absorb vitamin B12 as removal reduces the surface area available for absorption

Conclusion and Knowledge Gaps The intestinal barrier function is a complex integrated system composed of several pathways

10.1523/jneurosci.22-15-06537.2002 [DOI] [PMC free article] [PubMed] [Google Scholar] Sun Y., Zhu Y., Zhong X., Chen X., Wang J., Ying G

So how can you best pack up medicine such as prescription vitamin B12 injections , allergy medicine, or other prescription medicine for serious or chronic health conditions

3 months later after taking 5 mg of L-Methylfolate and 5 mg of active B12 each day, I had my level tested again and it came back at 136 (significantly improved and within normal range)

This means that it is not possible to overdose on vitamin B12, and as far as we know there is no upper limit on the amount of B12 that can be taken safely by an otherwise healthy person