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Description
Typical dosing is 600mg give 3 times daily

This is because B12 is synthesised by the bacteria in the gastrointestinal tract of animals, and then absorbed by the host animals

Wilson BA, Jahnke JR, Roach J, Azcarate-Peril et al
PO vitamin B 12
Avoid use in individuals with severe Leber hereditary optic neuropathy or nasal blockage