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If you fish around the internet enough, you will find some anecdotal claims of insomnia and restlessness linked to excessive B12 intake, but direct causality has yet to be analyzed by experts

October 8, 2015

You should not get a B12 injection if you are allergic to cyanocobalamin (vitamin B12)

Journal of Water Process Engineering, 53: 103669 Fitch A, Balderas-Hernandez P, Ibanez J G (2022)

Should cobalamin supplementation be considered
