b12 sublingual vs injection Frontiers Oral vitamin B12 versus intramuscular

Anaphylactic shock and death have been reported after parenteral vitamin B12 administration in sensitive patients

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10.1016/j.exger.2017.05.017 [DOI] [PubMed] 9.Wang H, Li L, Qin LL et al (2018) Oral vitamin B12 versus intramuscular vitamin B12 for vitamin B12 deficiency