While most of us are deficient in B12, some forms can methylate the mercury in us. My ND told me not to take the B12 on my chelating days....that is the one derived from cyanocobalamin...or there could be yeast in the B12 tablets too, that is a possibility too.

Here is a link to it.....

http://www.canarys-eye-view.org/metabolic_basis/poisoning/merc-pois-mech.html

If you google mercury and B12, you can find a lot more info.

That is why I don't like to take chelators without a break, you may need to replenish many of your mineral and B12 stores between chelations.

http://www.howweheal.com/vitaminb12.htm

Best love,
Sandi
xoxo