how effective are b12 injections Vitamin Shots Right for You? B12 Injections for Energy: Benefits

Headache or nausea is uncommon

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These extremely rare side effects include: Reactive thrombocytosis during the first week of use in megaloblastic anaemia Hypersensitivity reactions including: rash, itching, exanthema, antibodies to HYDR0XOCOBALAMIN-transcobalamin II Anaphylaxis Hypokalaemia Headache, paraesthesia, tremor Irregular heartbeat (arrhythmias secondary to hypokalaemia) Nausea Vomiting Diarrhoea Fever, chills, hot flushes, dizziness, malaise, pain and / or swelling at the injection site Acne Abnormal colouration of the urine (chromaturia) What should you not do after a B12 shot

Hair loss is not listed in the National Institutes of Healths Office of Dietary Supplements Vitamin B12 Fact sheet as a symptom of vitamin B12 deficiency