Human safety, efficacy, dosing, and clinical utility havent been established
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All B vitamins are water-soluble, so the body does not store them, and luckily, if you take too much it simply exits through your urine
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