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Further, clinicians have only recently begun to consider the unique advantages of nasal administration, spurring the development of pharmaceuticals that are highly bioavailable via the nasal mucosa

[5] Brcic, L., Kolenc, D., Blagaic, A.B., & Sikiric, P

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Additionally, if your gastrointestinal tract does not function normally, as with celiac disease or Crohns disease, you may have trouble absorbing or releasing vitamin B12, which will affect the levels in your body and how long the vitamin stays there

While cancer remains uncommon compared to other causes, doctors may order additional testing to rule out gastrointestinal cancers or blood cancers when symptoms continue worsening