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) B12 injections work quickly
Convenient once-per-week use
In some cases, alternative testing methods may be needed to distinguish true elevation from laboratory interference
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The more energy you have, the easier it is to get more physical activity and improve your exercise performance
B12 Deficiency Severity : If your B12 levels were extremely low, it may take longer for your body to adjust and for you to feel the effects