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I can't think of any way in which this would happen
Sublingual administration, which bypasses the gastrointestinal tract, appears to be equally effective as IM injections while being less invasive and more cost-efficientparticularly in patients with atrophic gastritis, post-gastrectomy status, or conditions that impair intrinsic factor-mediated absorption, where long-term intervention is often required
Because Vitamin B12 is water-soluble, the body doesnt store large amounts, meaning deficiencies are common
The Bottom Line Vitamin B12 injections can help if your gut doesnt absorb nutrients well or you dont want to take a daily oral supplement
Get your vitamin B12 levels tested A blood test that measures serum B12 (typically reported in pg/mL) is essential
And I havent seen many worrying side effects. Still, anytime you put something in your bodywhether its a triple cheeseburger or a supplement you might wonder if there are any downsides
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