For people with a B12 deficiency, injections are often prescribed because they allow for better absorption than oral supplements
For someone with mild fatigue and slightly low blood levels, a conservative approach of one injection every four weeks might be sufficient
How much B12 is in a shot
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
Your body requires vitamin B12 to work more effectively
[6] There are 4 common injection sites for administering B12, but you'll want to discuss what's best for you with your doctor