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Vitamin B12 injections intended to quickly raise Vitamin B12 levels and support health and wellbeing. The page discusses potential benefits including supporting energy metabolism, brain function, the immune system, red blood cell production, hair, skin and nails, eye health, sleep quality and memory. Possible side effects include pain, swelling or itching at the injection site, nausea or vomiting, diarrhoea, headaches, dizziness and hot flashes. Hydroxocobalamin contains cobalt and may cause sensitivity reactions. Consult a doctor or pharmacist if symptoms persist, and contact a doctor immediately for palpitations or signs of an allergic reaction.