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
The two work through different mechanisms and may produce additive benefits
Methylcobalamin is a form of vitamin B12 which is particularly recognised for its benefits to the nervous system as well as the immune system
How does vitamin B12 deficiency cause neuropathy
Reassuring yourself the effects are temporary as your body adjusts
Maximizing your energy and stamina could make your workouts more effective and enjoyable