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Methylcobalamin might be preferable for people with absorption issues or certain medical conditions like pernicious anemia

If the vitamin is administered by injection in response to a deficiency and enters the bloodstream directly in high concentrations, an immunologic reaction with skin reactions is possible

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Contact your GP if palpitations: Occur frequently or last longer than a few minutes Are accompanied by chest pain, tightness, or pressure Cause dizziness, light-headedness, or fainting (syncope) Are associated with shortness of breath at rest or on minimal exertion Occur alongside significant fatigue or weakness Develop in someone with a known heart condition or family history of cardiac arrhythmia Occur during pregnancy (contact your midwife or maternity triage service promptly) You should call 999 or go to A&E immediately if palpitations are severe, sudden in onset, and accompanied by chest pain, collapse, or difficulty breathing, as these may indicate a serious arrhythmia such as ventricular tachycardia or supraventricular tachycardia (SVT)

Int J Mol Sci 2018