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100mg vials Larger vials offer better value per milligram but require using the reconstituted solution within 30 days
While oral supplements are an option, they still have to go through the digestive system, where absorption issues can get in the way
Understanding this is the foundation for understanding why dosing is not a one-size-fits-all figure: the molecule behaves differently from the compounds people often group it with
Since the body does not make its own B12, it must be obtained through foods that are rich in B12
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