Do you get a bad reaction after eating eggs or broccoli? If so, your body might be impaired in its ability to process sulphur compounds. If you get a strong reaction after eating garlic but no after eggs, broccoli, or or high sulphur foods, then you might have a problem with parasites, candida, or bacterial overgrowth in your digestive system.

Sulphur is needed for detoxification of heavy metals. The glutathione your body produces contains sulphur, and all chelation agents have sulphur.

DMSA does not remove mercury from the brain and nervous system. cilantro may do that. People are afraid of cilantro as it might mobilize mercury without excreting much of it, however I think cilanto should be safe enough to eat in reasonable quantities while someone is in the middle of a chelation round using a decent sized dosage of DMSA.

Mercury may become lodged in the iodine binding sites of the thyroid. High doses of iodine(50 mg a day?) may be helpful to dislodge this mercury.

selenium supplements are essential for those who are mercury toxic. Selenium binds with mercury in the body making the selenium unavailable. Selenium is needed for the enzyme that converts T4 to the active T3. Be careful about taking too much selenium though.