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Dr. Duke's Phytochemical and Ethnobotanical Databases
U.S. Department of Agriculture
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List of Chemicals

Click on column headings to sort table by that column. *Unless otherwise noted all references are to (Duke, 1992)
Chemicals Reference
BETACAROTENE Pizzorno, J.E. and Murray, M.T. 1985. A Textbook of Natural Medicine. John Bastyr College Publications, Seattle, Washington (Looseleaf).
CHROMIUM *
SULFUR Martindale's 29th
ZINC *