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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
How its done The needle is inserted at a 90-degree angle so that it pierces the skin down into the muscle
When finished, remove the needle and dispose of it in a proper sharps container
Rarely, an allergic reaction (rash, throat tightness) can occur
Don't let the needle touch anything once the cap is off
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