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A toxic vitamin B12 overdose could not occur as the body will absorb what it needs from the B12 injected and excrete any excess in the urine
A Phase IIa trial published by Heffernan et al
Braun J, Loyal L, Frentsch M, Wendisch D, Georg P, Kurth F, et al
Preexisting SARS-CoV-2 cross-reactive T cells have been widely identified and are detected in up to three-quarters of individuals using sensitive assays and in vitro expansion [43, 67, 88,89,90,91]