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Biochemically, the cobalt center can take part in both two-electron and one-electron reductive processes to access the "reduced" (B 12r , +2 oxidation state) and "super-reduced" (B 12s , +1 oxidation state) forms
You're more likely to have vitamin B12 deficiency if you have a medical condition where your body can't absorb B12 or you follow a strict vegan diet
Chakrabarti/Campbell Am J Case Rep 2026
Why your new vial might look different from the last one Compounding pharmacies may adjust B12 concentrations between batches or formulations
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