| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Allium sativum var. sativum | Leaf | -- | -- | * | |
| Myrica cerifera | Root | -- | -- | * | |
| Glycine max | Shoot | -- | -- | * | |
| Silybum marianum | Seed | -- | -- | * | |
| Huperzia spp | Plant | -- | -- | * | |
| Cryptotaenia japonica | Shoot | -- | -- | * | |
| Melia azedarach | Plant | -- | -- | * | |
| Stachys officinalis | Shoot | -- | -- | * | |
| Lentinus edodes | Fruit | -- | -- | * | |
| Angelica sinensis | Root | -- | -- | Jim Duke's personal files. | |
| Oryza sativa | Hay | -- | -- | * | |
| Coriandrum sativum | Fruit | -- | -- | * | |
| Chondrus crispus | Thallus | -- | -- | Jim Duke's personal files. | |
| Coffea arabica | Seed | -- | -- | Leung, A. Y. and Foster, S. 1995. Encyclopedia of Common Natural Ingredients 2nd Ed. John Wiley & Sons, New York. 649 pp. | |
| Taraxacum officinale | Leaf | -- | -- | Hansel, R., Keller, K., Rimpler, H., and Schneider, G. eds. 1992. Hager's Handbuch der Pharmazeutischen Praxis, Drogen (A-D), 1209 pp., 1993 (E-O), 970 pp., 1994 (P-Z), 1196 pp. Springer-Verlag, Berlin. | |
| Cocos nucifera | Endosperm | -- | -- | Jim Duke's personal files. | |
| Plantago ovata | Seed | -- | -- | * | |
| Allium cepa | Bulb | -- | -- | Thomas, D. J., Parkin, K. L. 1994. Quantification of Alk(en)yl-L-Cysteine Sulfoxides and Related Amino Acids in Alliums by High-Performance Liquid Chromatography. J. Agr. Food Chem., 42(8): 1632-1638. | |
| Cocos nucifera | Leaf | -- | -- | Jim Duke's personal files. | |
| Alpinia galanga | Leaf | -- | -- | * |