nausea b12 injections Vitamin toxicity: Diarrhoea, dizziness or may be side effects to be aware of Vitamin B12 Deficiency - Harvard

Farm animals are often supplemented with cobalamin in their feed

Without baseline biomarker assessmentsuch as serum B12, homocysteine, or liver function markersit is difficult to determine whether deficiency in any component is limiting your metabolic capacity or whether supplementation will meaningfully improve outcomes

Tissue-level deficiency of cobalamin is associated with an increase in the urinary and serum concentrations of an organic acid called methylmalonic acid, which is an alternative product of a cobalamin dependent pathway within the mitochondria

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This is not a close comparison on clinical evidence