b12 injections pros and cons Vitamin Injections: What You Need To Know b12 deficiency injections side effects

Learn where to self-administer a B12 shot and how to do it painlessly This article was medically reviewed by Shari Forschen, NP, MA and by wikiHow staff writer, Amber Crain

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

For someone with mild fatigue and slightly low blood levels, a conservative approach of one injection every four weeks might be sufficient

Upper arm or shoulder area (right into your deltoid): The deltoid is the preferred area if someone you know is giving you the injection at home