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For everything else, bacteriostatic water is the standard
Cheap, mass-produced, or pre-mixed formulations sitting on shelves rapidly oxidize and lose potency
A conservative general window is about 28 days at 2-8 C when mixed with bacteriostatic water and handled cleanly
Clinical deficiency with clearly low blood levels affects a smaller percentage, but a much larger group falls into a gray zone where levels are low enough to cause subtle symptoms without triggering an obvious diagnosis
B12 supports brain function by promoting red blood cell production and oxygen flow
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