b12 injection time to work Benefits of Injections for Optimal Health What Is a Vitamin B12

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[DOI] [PubMed] [Google Scholar] 3.Siekmann JH, Allen LH, Bwibo NO, Demment MW, Murphy SP, Neumann CG

These side effects are generally mild and will subside on their own without the need for medical intervention

So the oral route is reasonable on paper and unverified in practice

PubMed Cox, H.D., Smeal, S.J., Hughes, C.M., Cox, J.E., & Eichner, D

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