Bentonite clay is volcanic ash! Get your dictionaries out before you put this dangerous material in your mouth! I am an amateur geologist and I fossil hunt in deposits of bentonite clay to find remains of extinct species of animals that were killed by inhaling the glass shards from the volcanic clouds of dust! It is a porous clay, produced by the decomposition of volcanic ash, that is able to absorb much water and swell greatly as a result. I wear a face mask when working around it. I guess if someone will bottle and sell it...someone will buy and eat it, but you'd have to be out of your mind! Gail Vass, RN