I get confused about the whole thing as Im sure a lot of us do. But I have to go with Dental Haulocaust at the moment cos of one thing. DMSA to my knowledge chelates the body organs and then you have to chelate the brain with ALA. This is my understanding. I hope Chris wont mind me saying but both he and I have quite sever brain and nervous system problems. He can correct me if Im wrong, but I think is doctor is pretty well informed and Im pretty sure mine was. As I believe both NCD and Zeolite, which Im going to be using, chelate body and brain. I actually questioned my doctor about this and if its been used alone in children with autism I assume this must be true. Its certainly nothing to do with money but if it does both jobs, Im up for it . Maybe Chris can back me up on this Tracy