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Description
A challenge with this vitamin is that some people can eat plenty of B12-rich foods but still can't absorb it properly

doi: 10.1093/fampra/cml008
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What about cyanocobalamin

Zhong, Nanosuspension drug delivery system: preparation, characterization, postproduction processing, dosage form, and application, in Nanostructures for Drug Delivery, Elsevier, 2017, pp
