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doi: 10.1128/MCB.23.5.1614-1622.2003

One solution to this problem of B12 deficiency is to supplement with B12 shots

Karimi M, Eslami M, Sahandi-Zangabad P, Mirab F, Farajisafiloo N, Shafaei Z, et al

A B12 injection is a straightforward, quick treatment with no downtime
