Vitamin B12 has proven to be safe for most people, even in large doses
Sublingual B12: Pros and Cons Sublingual B12 supplements dissolve under the tongue, where some of the vitamin may be absorbed through the tissues in the mouth before being swallowed
Certain health conditions If you have a stomach or small intestine condition such as celiac disease or Crohn's disease, you may not be able to absorb enough vitamin B12 from food
While the vitamin can start providing benefits in your body almost immediately following injection, most patients will start to notice the benefits after a few days
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And when you do, it can significantly affect your metabolism, weight control, stress management, and general well-being