| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Cocos nucifera | Seed | 7.0 | 13.0 | -0.7 | * |
| Cocos nucifera | Seed Oil | -- | -- | 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. | |
| Corylus avellana | Essential Oil | -- | -- | * | |
| Corylus avellana | Seed | -- | 240.0 | 0.0 | * |
| Cucumis sativus | Fruit | 0.4 | 38.0 | -0.5 | * |
| Cucumis melo | Fruit | 1.4 | 14.0 | -0.9 | USDA's Ag Handbook 8 and sequelae) |
| Cucurbita pepo | Stem | -- | -- | * | |
| Cucurbita pepo | Fruit | 10.0 | 119.0 | 0.7 | USDA's Ag Handbook 8 and sequelae) |
| Cucurbita pepo | Leaf | -- | -- | * | |
| Curcuma longa | Root | 11.0 | 18.0 | -0.1 | * |
| Daucus carota | Root | 4.0 | 36.0 | 1.3 | * |
| Daucus carota | Leaf | -- | 788.0 | 1.5 | * |
| Elaeis guineensis | Fruit | 75.0 | 125.0 | 0.8 | Abstract (See species file) |
| Elettaria cardamomum | Seed | -- | -- | * | |
| Eleutherococcus senticosus | Root | -- | -- | * | |
| Eucalyptus globulus | Leaf | -- | 333.0 | -0.0 | * |
| Fragaria spp | Fruit | 1.0 | 54.0 | -0.3 | * |
| Glycine max | Leaf | 29.0 | 280.0 | -0.2 | Jim Duke's personal files.* |
| Glycine max | Cotyledon | -- | -- | * |