An oral supplement has to travel through your digestive tract, survive stomach acid, bind to a protein called intrinsic factor, and be absorbed in the small intestine
Surprisingly, one study 20 showed that even in patients who had undergone gastrectomy, vitamin B 12 deficiency could be easily reversed with oral supplementation
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Your prescriber will determine the right approach for your goals
And placebo is real getting an injection in a clinical setting with the expectation of feeling better is a powerful experience
However, the primary use of B12 injections around the world, and the main reason people need it so badly, is because of a disorder called pernicious anemia