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For laboratory research applications, it may be reconstituted using bacteriostatic water or another suitable solvent according to established research protocols

Cyanocobalamin | Drugs | BNF NICE

Take it after breakfast to avoid nausea

Sublingual transport is the best way to get B12 absorption (research has proven it's even better than B12 injections for increasing B12 sufficiency)

Hematol Oncol Clin North Am 32:165175 Weatherall DJ (2010) The inherited diseases of hemoglobin are an emerging global health burden

You must discard the pen if it has been out of the fridge for more than 28 days or exposed to higher temperatures