Data Views Total Plants: 2 CSV Excel PDF Click on column headings to sort the list on the column Plant Part Low PPM High PPM StdDev *Reference Panax quinquefolius Root -- 2.8 1.0 * Panax ginseng Root -- 2.1 -1.0 * *Unless otherwise noted all references are to Duke, James A. 1992. Handbook of phytochemical constituents of GRAS herbs and other economic plants. Boca Raton, FL. CRC Press.