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My understanding is that testing B12 during treatment is not normally needed

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10.1186/s13018-019-1242-6 86 PetekM.SikiricP.AnicT.BuljatG.SeparovicJ.Stancic-RokotovD.et al (1999)

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[16] [41] : 972 However, looking at the same scientific evidence, the European Food Safety Authority (EFSA) sets adequate intake (AI) at 4.5 g/d for pregnancy and 5.0 g/d for lactation

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