where to administer b12 injection Vitamin Sites: All You Need Know Safe B12 Injection Guide at

Shoulder - make a downward-facing triangle over the deltoid muscle on the upper arm with the thumb and forefinger of the non-injection hand

Vitamin B12 shot side effects Most people tolerate vitamin B12 injections well, but possible side effects include: Mild: soreness or redness at injection site, mild diarrhea, nausea, headache, itching Rare but serious: allergic reactions (rash, swelling, difficulty breathing), low potassium (hypokalemia), dizziness or heart rate changes Get emergency medical help if you have signs of an allergic reaction to Vitamin B12: hives

PMID: 22306884

If standard treatment is not helping, our providers can investigate further to find the underlying cause