| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Coix lacryma-jobi | Pericarp | -- | -- | * | |
| Commiphora wightii | Resin, Exudate, Sap | -- | -- | Jim Duke's personal files. | |
| Convallaria majalis | Plant | -- | -- | * | |
| Coptis spp | Rhizome | -- | -- | * | |
| Coptis japonica | Rhizome | -- | -- | * | |
| Coptis chinensis | Rhizome | -- | -- | * | |
| Coriandrum sativum | Plant | -- | 11.0 | -1.4 | * |
| Cucumis sativus | Fruit | -- | -- | * | |
| Cucumis melo | Plant | -- | -- | Stitt, Paul. Why George should eat broccoli. | |
| Cucurbita pepo | Plant | -- | -- | * | |
| Cydonia oblonga | Fruit | -- | -- | * | |
| Cynara cardunculus | Plant | -- | -- | * | |
| Datura stramonium | Plant | -- | -- | * | |
| Daucus carota | Root | -- | -- | * | |
| Digitalis purpurea | Leaf | -- | -- | * | |
| Dioscorea alata | Plant | -- | -- | * | |
| Dipteryx odorata | Leaf | -- | -- | Grenand, P., Moretti, C., and Jacquemin, H. 1987. Pharmacopees Traditionnelles en Guyane. l'ORSTROM, Paris. 569 pp. | |
| Echinacea spp | Plant | -- | -- | * | |
| Elaeagnus angustifolia | Leaf | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. | |
| Eleutherococcus senticosus | Root | -- | -- | * |