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doi:10.1007/s00198-021-05966-8

Took my 2nd dose of Pfyzer today with no reactions so far

Even considering all of these factors you need to understand that checking vitamin B12 levels in the serum still isnt the best way to evaluate for B12 deficiency

Brzozowski T, Konturek PC, Pajdo R, et al

[DOI] [PMC free article] [PubMed] [Google Scholar] 50.Camacho-Pereira, J

What is the status of supplemental oxygen
