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Changing brands of vitamin B12, forms of B12 (cyanocobalamin vs hydroxocobalamin), or switching from injections to tablets can be a solution in those (rare) cases
Laboratory and/or medical tests (e.g., serum potassium levels, complete blood count, hematocrit, vitamin B-12 levels) should be performed to monitor your progress or check for side effects
PMC 4437467
Yuccah Wetting Agent
Cyanocobalamin acts as a precursor for the bioactive forms of vitamin B12, methylcobalamin, and adenosylcobalamin, which are critical co-factors in DNA synthesis and red blood cell production
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