Methylcobalamin is the active coenzyme form of B12, while cyanocobalamin is a synthetic form requiring conversion in the liver
Elevated serum B12 values in serious conditions Maybe the concern for a possible overdose is caused by the knowledge that some life-threatening diseases can be accompanied by a strong increase in the B12 blood value, in some cases to even 30 times the upper reference value
2018, doi:10.1155/2018/1968450 Tabrizi R, Ostadmohammadi V, Lankarani KB, et al
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doi:10.1177/1535370217746612