vitamin b12 injection versus oral Injections vs Pills: Richmond's Complete Guide Vitamin B injections vs tablets:

Patients with evidence of vitamin B 12 deficiency and chronic gastrointestinal symptoms such as dyspepsia, recurrent peptic ulcer disease, or diarrhea may warrant evaluation for such entities as Whipple's disease (a rare bacterial infection that impairs absorption), Zollinger-Ellison syndrome (gastrinoma causing peptic ulcer and diarrhea), or Crohn's disease

FAQS What are the benefits of a vitamin B12 injection

A vitamin B12 deficiency may not show signs at first, especially if the deficiency is mild

Instruct patients to contact their healthcare provider for appropriate clinical follow-up if gallbladder disease is suspected [see Warnings and Precautions (5.8)]