Great Plains Bentonite is specially formulated to provide the maximum benefits of bentonite. Great plains is a mineral source dietary supplement that traps and binds unwanted, non-nutritive substances such as herbicides and other potentially harmful substances so that they do not remain in the body. Bentonite's mechanism of action is physical, due to its colloidal structure and charged particles. The total absorptive surface area of each tablespoon serving of Great Plains Bentonite is over 900 square yards. Great Plains is a unique naturally occurring bentonite with the proper mineral composition for maximum ability to remove unwanted substances.