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In some cases, you may be able to get adequate Vitamin B12 by making slight adjustments to your daily diet
If you like this article, you may also like What to Expect After A B12 Injection Maximizing Your B12 Shot: Post-Injection Tips Now that youve had your B12 injection, youre well on your way to feeling more energized and revitalized
Unlike most vitamins, B12 has a uniquely complex absorption pathway: Stomach acid and pepsin release B12 from food proteins B12 binds to R-proteins (haptocorrins) in saliva and stomach Pancreatic enzymes release B12 from R-proteins in the small intestine B12 binds to intrinsic factor (produced by gastric parietal cells) The B12-intrinsic factor complex is absorbed in the terminal ileum A breakdown at any of these five steps causes deficiency which is why B12 deficiency is far more common than dietary intake alone would predict
Olasupo Odunsi, MD, Medical Director Reviewed July 22, 2026 B12 shots are marketed everywhere as a weight loss booster
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