Also keep in mind that if it is in the tissue there are mild chelators that pull heavy metals out of storage and into lymph so that the clay can "pull" them out of the body. One has to figure out which clay bath to use which can be done with hair analysis along with a chelation challenge.
I have seen a few egroup comments on it not being of help but I would question their total protocol (if they have zeroed in on the right clay, etc and if their metals were in tissue storage necessitating stimulation out of storage.) Too many people have had greast success for it to be ingonred. Also, many dentists and naturopaths are using this with good success. IV chelators are dangerous and have injured may people by agressively pulling metals out of safe storage, over loading the liver and kidneys, then redepositing heavy metals into sensitive areas.
The founder of LL Magnetic Clay is in the middle of putting together more documented results. I will let you know when they are available. Clinics all over the world are now utilizing this particular clay. Pascalaite clay is good but this blend has proven to be much better.