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The choice between these methods depends on factors such as the specific formulation, patient preference, and healthcare provider recommendations
For any immediate trouble breathing or swelling of the lips/tongue, call 911 or go to the nearest ER right away
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
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