By comparison, oral B12 supplements are absorbed at roughly 1 to 5% in healthy adults, and even less if you have low intrinsic factor, atrophic gastritis, celiac disease, Crohn's, or a history of gastric bypass
Since most people are able to consume enough vitamin B12 through their diet, only those who have trouble getting or absorbing enough of the nutrient can benefit from the shot
Because you are eating less and your body is processing food differently, you may be at a higher risk for deficiencies in vitamin B12, vitamin D, and iron
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Similarly, individuals with Crohns disease or ulcerative colitis may experience compromised B12 absorption, and injections can be an effective way to address this