MMS is a chemical called sodium chlorite. When mixed with a citric acid, as directions for use suggest, it becomes chlorine dioxide, an industrial strength bleaching agent. In 2006 Jim Humble, a former aerospace engineer, published a book called The Miracle Mineral Solution of the 21st Century. In the book Humble described his discovery of this magical health elixir while prospecting for gold in South America. Humble claimed, what he later came to call MMS, was a cure for malaria.