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
If you are a strict vegetarian or vegan and do not eat any meats, dairy foods, or eggs, you will not get enough vitamin B12 from your diet alone
It does not typically occur in plant foods
Grip strength increased by approximately 60% when the compound was combined with rigorous exercise training, compared to about 25% improvement from either exercise or treatment alone