half life of vitamin b12 injection How Long Does Last In Your System For those taking injectable B12,

There is After having a B12 shot, a person should monitor for adverse symptoms and seek medical help if they experience: severe pain at the injection site mild diarrhea a swelling sensation in the body temporary itching of the skin In rare cases, a person may also be at risk of: anaphylaxis pulmonary edema congestive heart failure peripheral vascular thrombosis, which involves blood clots polycythemia vera, which is a type of blood cancer If anyone experiences difficulty breathing, hives, or swelling, they need emergency medical help

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Walls AC, Miranda MC, Schfer A, Pham MN, Greaney A, Arunachalam PS, et al

People with severe absorption problems or specific health issues might need shots

It is involved in the formation of red blood cells, the function of the nervous system, and the metabolism of proteins, carbohydrates, and fats