PCA-Rx uses a unique form of Chelation Therapy which is called Clathration. Clathration uses PCA-Rx as its oral chelating agent. PCA-Rx is also unique in that it claims to have been prove effective in reversing some of the symptoms of autism in children. It is claimed the PCA-Rx is safer and gentler to use. PCA-Rx is a living formula containing helpful bacteria and other microbes. Visit www.awakennutrition.com.