Data Views Exclude Ubiquitous Chemicals Activities: 200 Chemicals w/Activities: 22 CSV Excel PDF All Chemicals: 37 Previous12 Show all rows. Paginate rows. Click on column headings to sort table by that column # Activity Chemical Part All Plant Root Seed Low PPM High PPM StdDev *Reference 4 4 XANTHOHUMOL Root -- -- * 77 77 ZINC Root 10.0 24.0 -0.01 * *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.