b12 deficiency injection dose CYANOCOBALAMIN INJECTION, USP 30000 mcg/30 mL (1000 mcg/mL) 30 mL VIAL Vitamin B12 for Injection Cyanocobalamin

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But a monthly 4000 mcg dose would be 4 mL, with the same concentration

Hempill-Bryant explains that babies born to B12 deficient mothers will also be deficient in B12, especially if they are then exclusively breastfed. A study in the Journal of Child Neurology found that the most severe cases of B12 deficiency can lead to weakness, failure to thrive, afebrile seizure, developmental delay, nystagmus, tremors, and involuntary movement among young babies

Patients taking certain medications (e.g., chloramphenicol may reduce the effectiveness of B12 therapy) or with risk factors for B12 deficiency (metformin use, proton pump inhibitors, nitrous oxide exposure, vegan diet) should discuss these with their healthcare provider

You've got to consider the practicalities on the ground