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So how do you know if you are actually vitamin B12 deficient

Retinol is the active form of Vitamin A that your body can use immediately

[DOI] [PubMed] [Google Scholar] 69.Wipperman M.F., Montrose D.C., Gotto A.M., Jr., Hajjar D.P

[DOI] [PMC free article] [PubMed] [Google Scholar] 26.Petukhova VZ, Aboagye SY, Ardini M, Lullo RP, Fata F, Byrne ME, Gabriele F, Martin LM, Harding LNM, Gone V, et al

Vitamin B12 overdose & toxicity
