Data Views Plants (>= 1 Chemical): 620 All Chemicals: 21 CSV Excel PDF Previous12 Show all rows. Paginate rows. Click on column headings to sort table by that column Chemical Dosage References ZINC 100 mg/dayWerbach, M. 1993. Healing with Food. Harper Collins, New York, 443 pp. *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.