Do not attempt to chelate mercury until you are familiar with the Andrew Cutler protocol. You might think there are lots of alternative sites out there that are all giving pretty much the same advice. Cutler, who himself was very badly damaged by mercury, is the world expert bar none. Never use DMSA, DMPS or lipoic acid, or any natural substances to chelate mercury such as cilantro or chlorella (or for any other purpose) until you fully understand the Cutler protocol. Do not chelate with the help of any health professional or doctor until you understand this protocol.
The Cutler protocol is based on the principle that as you chelate mercury from body fat (where most of it is stored and remains harmless) it is redistributed to organs and to the CNS unless you know exactly what you are doing. You should never, repeat NEVER use a substance that can chelate mercury from the brain and spine (i.e. a chelator that can cross the blood brain barrier such as lipoic acid or cilantro) until you have removed most of the mercury from the body fat and organs.
If you ignore this advice you will almost certainly end up making the problem worse, as i did for many years. Six 25mg capsules of DMSA at 25mg (taken at intervals of 3-4 hours day and night for 3 days followed by a rest period of several days) will remove approx. 1% of mercury per day.
How do I know 1%? - because Cutler is a biochemist who probably understands the science behind mercury better than anyone else in the world. Doctors simply read scientific reports and do not have the time or inclination to truly understand mercury.
I am currently on my fifth round of DMSA (3 days on 4 days off) and hoping, with the later addition of lipoic acid, to remove all mercury with 2 years.