how often do you get vitamin b12 injections Injection Frequency: Should a Shot? How Often Should You Get
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The two always travel together on the claim

People who have gastrointestinal disorders like celiac disease or Crohn's disease or who have undergone weight-loss surgery may secrete too little hydrochloric acid or intrinsic factor

As for the IV fluid itself, saline is likely to make a dehydrated person feel better, and dextrose may be good for alcoholic ketoacidosis

[DOI] [PubMed] [Google Scholar] 68.Huang Y, Cohen JC, Hobbs HH
