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Cyanocobalamin is more stable in solution and less expensive
Oral B12 supplements require daily intake and have much lower bioavailability only about 1 to 2% is absorbed without intrinsic factor.
That is a fundamental principle in pharmacology, and it applies here
Some products marketed as bacteriostatic water don't meet pharmaceutical standards
Once you open a vial of sterile water and introduce a needle, bacteria can begin to multiply
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