"As far as DMPS being 10x more expensive...it's also anywhere from 10-20 times more effective which in actuality would make it cheaper overall."

Care to provide some proof of that? The articles I read say DMPS is slightly better than DMSA at chelating mercury but is also several times as toxic. The absorption of DMSA is also greatly reduced if it is taken with food. When I chelate, I eat quickly 30 minutes after I take the dose.

Some people might not tolerate DMSA. I am not disputing this. Many who can't tolerate DMSA also can't tolerate ALA and also have problems with some other sulphur compounds. It is also likely that they will have trouble tolerating DMPS. Perhaps they also might be sulphur deficient, in which case the body might break down the chelating agents in order to get the sulphur it is starving for, and these chelating agents won't be able to chelate. I am on a high sulphur diet, and I think this helps the DMSA and ALA to work more effectively at chelating. Perhaps some who have trouble tolerating DMSA and ALA might be deficient in molybdenum?