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 mechanisum of action is physical, due to its colloidal structure and charge particles. The total adsorptive surface area of each tablespoon serving of Great Plains® Bentonite is over 900 square yards. Great Plains® is a unique naturally occuring bentonites with proper mineral composition for maximum ability to remove unwanted substances.