Hi Sonia..Oooh there was a lot of discussion about this a few months ago.
I'll try to find the posts later on.
The bottom line, for me, is that the man who brought Bentonite to a lot of people (forget his name) has been taking it for years and years. He's done hair samples (to test the level of aluminum) over the years and hasn't accumulated any aluminum.
I think it's because the teeeny bit of aluminum in it just sticks with it (just like toxins adhere to the bentonite) and gets flushed out. Bentonite acts physically, not chemically.
I'll see if I can find those posts and pages from way back...