Although I haven't done any physical research on bentonite, I tend to believe that bentonite (and some other "baths") are beneficial. They are working on another principle that makes more sense. Laura has done some research on it as well and it seems to pan out well.

I would love to perform some controlled experiments with some of the clays to see what's really happening (with all my fee time <img src="/ubbthreads/images/graemlins/smile.gif" alt="" /> ), but I would predict that we would see some action happening here.

So far as the ionic foot baths... I just haven't seen the evidence nor does it make much sense in terms of removing heavy metals.

I'm still finishing up the research but the preliminary writeup on our data can be found at this location:

http://herballure.com/Studies/IonicFootSpa.html