<<Disclaimer: Verify this information before applying it to your situation.>> There had been a question about aluminum in bentonite. There is plenty. Bentonite is a mixture of clay minerals, principally montmorillonite (a hydrated aluminum-magnesium silicate), which can contain up to about 13% aluminum by mass. But the real question is whether this Al is bioavailable or not -- it might just pass right on through. --Steve in Shiprock - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Steven C. Semken, Ph.D Navajo Dryland Environments Laboratory and Earth Sciences Program Navajo Community College POB 580, Shiprock, Navajo Nation, New Mexico 87420-0580 USA (505) 368-2020 [log in to unmask] Our website is http://www.ncc.cc.nm.us/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -Biighah.