In the southern United States in the 1800s, geophagia was a common practice among the slave population. Geophagia is a form of pica in which the person consumes earthly substances such as clay, and is particularly prevalent to augment a mineral-deficient diet. Noteworthy is the fact that kaolin was consumed by West Africans enslaved in the Southeastern United States, particularly the Georgia belt, due to the antidiarrheal qualities in the treatment of dysentery and other abdominal ailments. The practice of consuming kaolin rocks was thereafter studied scientifically, the results of which led to the subsequent pharmaceutical commercialization of kaolinite, the clay mineral contained in kaolin. Kaolinite became the active ingredient in drugs such as Kaopectate and Pepto-Bismol, although the formulations have since found additional active ingredients to replace kaolinite.