Data Views Exclude Ubiquitous Chemicals Activities: 227 Chemicals w/Activities: 22 CSV Excel PDF All Chemicals: 38 Previous12 Show all rows. Paginate rows. Click on column headings to sort table by that column # Activity Chemical Part All Rhizome Root Low PPM High PPM StdDev *Reference 5 5 XANTHOTOXOL Rhizome -- -- * 77 77 ZINC Root -- 26.0 0.08 * *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.