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Continue until the solution appears completely clear with no visible powder
Heat and freezing are not, and both can end a vial's usable life well before its printed date
Xue et al., 2004a
However, it is important to understand that 24 weeks, while substantial for clinical trials, provides limited information about safety with years-long continuous use
How to give yourself a B12 shot at home: Methylcobalamin vs Cyanocobalamin If you are using B12 shots its also very important that you use the correct form of vitamin B12
On the other hand, the bioavailability of B12 from dietary supplements is 50% more than that from food sources
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