Data Views Total Plants: 3 CSV Excel PDF Total Activities: 12 Click on column headings to sort table by that column Plant Part All Leaf Plant Low PPM High PPM StdDev *Reference Aloe vera Leaf -- -- * Frangula alnus Plant -- -- * Frangula purshiana Plant -- -- * *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.