Couple notes...

Yes, good information about B-12. It's usually too low in mercury toxic people and can make people feel better, however, it methylates mercury which enables it to pass through cell walls (bad).

On the other hand, it enables the processing of homocysteine and therefore lowers it's levels which are classically high in mercury toxic people. High homocysteine is related to heart diseases and other circulatory issues.

From the web:

"Homocysteine is formed by the body as a naturally synthesized byproduct of methionine ( a very important amino acid in your body) metabolism. Like cholesterol, homocysteine performs a necessary function in the body, after which, if the right cofactors are present, it will eventually convert to cysteine (and this is one of the amino acids needed to produce glutathione, which is very critical in your detoxifications pathways.) and other beneficial compounds such as ATP, (the energy molecule of the body) and S-adenosylmethionine (SAM). When left intact, it enters the bloodstream and begins attacking blood vessel walls, laying the foundation for heart disease, stroke and other cardiovascular diseases."

Flaxseed can help mercury toxic people because it's necessary to rebuild the nerve sheathing that gets destroyed in mercury toxic people. When nerve sheathing is destroyed, a number of painful (and not painful) neurological diseases set in.