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PA requirements vary significantly by specialty

doi:10.1007/s00405-020-06193-3 Kasahara T, Ikeda S, Sugimoto A, et al

Vitamin B12 (cobalamin) is essential for red blood cell formation , nervous system function , and the reduction of tiredness and fatigue

Ive been looking at reports from the Health & Human Services Vaccine Adverse Events Reporting System (VAERS) also
