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Also, you can ensure the quality of the B12 itself by choosing to buy from a pharmaceutical-grade source

The expiration date on meds is the time limit that the dosage potency is guaranteed

doi:10.1016/s1353-8020(11)70045-1 Patel S, Vajdy M

In solution, cyanocobalamin produces the classic deep red to pink color that most people associate with B12
