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Oral supplements are an option for many people

Yang et al., 2022

Note that these have implemented as a crucial diagnostic tool in ophthalmology

doi: 10.1016/j.it.2020.11.002 55 De FloraS.BalanskyR.La MaestraS

However, serious health complications can develop due to improper administration including sepsis (blood poisoning)

Why dont herbivores develop B12 deficiency