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Either way, you likely dont feel very well, because your body relies on B12 for many of its typical functions like red blood cell production and neurological function
Clinical Nutrition, 38(4), 1747-1755
What happens at your B12 injection appointment
Pharmacokinetics: Cyanocobalamin is administered intranasally, orally, and parenterally, while hydroxocobalamin is administered only parenterally. Once absorbed, vitamin B12 is highly bound to transcobalamin II, a specific B-globulin carrier protein and is distributed and stored primarily in the liver as coenzyme B12. The bone marrow also stores a significant amount of the absorbed vitamin B12. This vitamin crosses the placenta and is distributed into breast milk. Enterohepatic recirculation conserves systemic stores. The half-life is about 6 days (400 days in the liver). Elimination is primarily through the bile; however, excess cyanocobalamin is excreted unchanged in the urine
No significant adverse effects were reported at any dose level tested, including the highest 1mg daily oral dose
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