You're very wise to be concerned about the protocol used while taking the mercury out. There are supporting supplements that you can take. Be sure to research it. Hal Huggins protocol is the safest.

I'm currently reading the book "Amalgam Illness, diagnosis and treatment". You can get it through Russ and Laura on this site. After my amalgams were out, and I had decided on how to chelate, I started on the supporting supplements that he lists in this book and have been amazed at how they have helped in my chelation process.