Jinx, both the methyl and cynano form of B12 can potentially methylate mercury. The cyano must be turned into the methyl form during a process in the body to be able to do its job. Taking the methyl form means that you are simply skipping the process in your body so you are more guaranteed that it will work.

Personally I get panicky and nervous of all B-vits no matter the dose and especially the B12. If you are prepared to take the heat you could test them out to see if you react good or bad.

Lizzie