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Oral contraceptives can decrease the action of Mecobalamin by reducing its concentration in the body
This is where the debate truly begins

This is important for both clinical decisions and medical billing

I am thinking of booking 2nd dose later on or getting Johnson & Johnson as 2nd dose per CDCs suggestion to people with severe allergic reaction

N Engl J Med 350(9):896903 Principi N, Esposito S (2020) Do vaccines have a role as a cause of autoimmune neurological syndromes

Shibata et al., 1988
