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
Other patients have reported dark spots at the injection site which also fade over a few months
Vitamin B12 Deficiency Symptoms | Signs & NHS Treatment Vitamin B12 deficiency symptoms can be subtle yet far-reaching, affecting the blood, nervous system, and overall wellbeing
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