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M., Mohan, S., Syed, N
If a persons B12 deficiency is due to diet, they may not require further shots or only require them once or twice per year
Poirier, P
So people at greatest risk for deficiency include those with low stomach acid (e.g., older adults and people on proton pump inhibitors or antacids) or low IF production (known as pernicious anemia), people on medications that interfere with B12 absorption (such as metformin), people who have had gastric surgery, those with GI conditions that impair nutrient absorption (like celiac or Crohn's disease), and people on vegan and vegetarian diets
Careful explanation was sufficient reassurance that there would be no untoward effects
