Re: PCA-Rx oral chealtion versus dmsa or dmps ?. Kevin on Sep 1, 2003, 10:02 PMawaken nutrition. jp on May 7, 2004, 7:19 AMdmsa or dmps. Roxane on Oct 5, 2003, 6:22 PMChelation - PCA-Rx, NDF, DMSA. Luis Augusto Federighi on Jun 5, 2004, 5:30 PM