I have been using a supplement by daystarbotanicals called Lifeforce and Fruitful harvest while ther others out on the market I went with this because of the relation of toxins in nutritional yeast like how its cousin Mono-Sodium-Glutamat (Natrium Glutamat) is made which this product doesn't use. But the main reason is to alkalize the body and the super food Chlorella helps to bind metals including mercury.
Dr. Mercola on his site had some good articles on mercury poisoning and the use of this superfood Chlorella! and also using Codliver oil which has vitamin D in it. I have known a few people with the MS symptoms related to silver filings so the big thing is keep good nutrition up at all time and detox yourself after having the mercury filling removed.