Data Views Exclude Ubiquitous Chemicals Activities: 33 Chemicals w/Activities: 1 CSV Excel PDF All Chemicals: 18 Click on column headings to sort table by that column # Activity Chemical Part All Bark Plant Low PPM High PPM StdDev *Reference 35 35 TANNIN Bark 200000.0 270000.0 1.13 * *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.