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
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Notes: A 60-capsule container represents a 20-day supply at the 150mg/daily dose, a 40-day supply at the 100mg/daily dose, and a 60-day supply at the 50mg/daily dose
But when you feel that startling flutter, pound, or skip in your chest, it's only natural to wonder, "Is it really B12, or could it be something else?" That uncertainty can easily spike your anxiety, especially when you feel like you're not getting clear answers about what's happening inside your own body