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Why not use breathable vitamins? They are able to be absorbed more quickly and resist degradation, delivering the active ingredients more efficiently.
The vitamins could be ground into tiny particles and packed into an inhaler. The spray of vitamins will be directed upward, rather than down the throat, allowing the vitamins to be absorbed by the tissues lining the cheeks.
This method will send the vitamins more directly to the bloodstream and allow for a more potent delivery.