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Parenteral and intranasal cyanocobalamin, vitamin B12 are classified as pregnancy category C

They correspond to two different documented protocols and per-dose amounts (150 mcg vs 2.5 mg)

Cyanocobalamin is also contraindicated in patients with cobalt hypersensitivity because cyanocobalamin contains cobalt

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Dose and route depend on the severity of any deficiency and your absorption profile your clinician can guide repletion if needed, while a well-formulated daily supplement handles maintenance